Editing Delta Green

{{Short description|Tabletop horror role-playing game and game setting}}
{{Italic title}}
{{Use mdy dates|date=August 2024}}
{{Infobox RPG
|title=''Delta Green''
|subtitle=
|image=Delta Green.jpg
|caption=Delta Green sourcebook cover
|publisher={{Unbulleted list|[[Pagan Publishing]]|[[Arc Dream Publishing]]|[[Pelgrane Press]] (The Fall of Delta Green)}}
|date={{Unbulleted list|1997 (Sourcebook)|2016 ([[Arc Dream Publishing]]) (Standalone RPG)|2018 (The Fall of Delta Green)}}
|genre=Horror, [[Conspiracy fiction]]
|system={{Unbulleted list|[[Call of Cthulhu (role-playing game)|Call of Cthulhu]]|[[Gumshoe System|GUMSHOE]]}}
|designer={{Unbulleted list|[[Dennis Detwiller]]|[[Adam Scott Glancy]]|[[John Scott Tynes]]}}
|web=<!-- None -->
|isbn=<!-- None -->
}}
'''''Delta Green''''' is a contemporary era setting for the [[Call of Cthulhu (role-playing game)|''Call of Cthulhu'']] [[role-playing game]] created by [[Adam Scott Glancy]], [[Dennis Detwiller]], and [[John Scott Tynes]], a.k.a. the Delta Green Partnership, of the [[Seattle]] gaming house [[Pagan Publishing]]. The setting first appeared in a 1992 RPG scenario<ref>Tynes, J.S. 1992. Convergence. ''[[The Unspeakable Oath]]'' #7.</ref>{{Better source needed|date=February 2022|reason=The current source is the primary source}} and revolves around a secretive organization tasked with protecting the United States from paranormal and alien threats. ''Delta Green'' combines the classic 1920s [[Cthulhu Mythos]] of [[H.P. Lovecraft]] with modern [[conspiracy fiction]].

In August 2011, [[Arc Dream Publishing]] and the Delta Green Partnership announced development of a standalone ''Delta Green'' role-playing game.<ref>{{cite web|url=http://arcdream.com/home/?p=847|title=Unspeakable! Special Presentation: The Unspeakable Oath and the Delta Green RPG|date=August 12, 2011 }}</ref> Funding began in 2015 and in 2016 the ''Agent's Handbook'' was released followed by the ''Handler's Guide'' in 2018. Arc Dream Publishing also made a partnership with [[Pelgrane Press]] to release a prequel named ''The Fall of DELTA GREEN'' using the [[Gumshoe System]] in 2018.<ref name="site.pelgranepress.com">{{cite web |url=http://site.pelgranepress.com/index.php/the-fall-of-delta-green/ |title = The Fall of DELTA GREEN – Pelgrane Press Ltd}}</ref>

==Premise==
''Delta Green'' is a contemporary setting, starting in the mid-1990s, with intermittent updates thereafter. The game revolves around a fictitious secret organization, created by the [[U.S. Government]] following the covert raid on the town of [[Innsmouth]], [[Massachusetts]] mentioned in [[H. P. Lovecraft]]'s ''[[The Shadow over Innsmouth]]''. The organization takes its name from its [[World War II]]-era codename.

Delta Green agents work undercover through other U.S. government agencies, recruiting across a wide range including the [[FBI]], [[Bureau of Alcohol, Tobacco, Firearms and Explosives|ATF]], [[CIA]], [[Centers for Disease Control and Prevention|CDC]], [[Drug Enforcement Administration|DEA]] and the [[U.S. Military]]. It appears to have "gone rogue" somewhere between the 1960s and the 1980s, following a disastrous operation in [[Cambodia]] and a "deal" struck by [[Reagan administration|Reagan-era]] rivals in [[Majestic-12]], ostensibly with "[[Grey alien|Greys]]". Delta Green must not only contain incursions from creatures from the [[Cthulhu Mythos]], but also secret conspiracies and rogue organizations that seek to weaponize its powers.

The 2016 edition advances the history to the 2010s. In 2001, the [[September 11 attacks]] greatly affect the [[United States Intelligence Community|Intelligence Community]], including Delta Green and MAJESTIC-12. Majestic was weakened and destroyed, while Delta Green has been brought back into the government fold, given a budget and official standing, using the [[War on Terror]] as a cover to their operation. There's also a group of old guard agents that were opposed to the restructure of Delta Green, preferring to maintain the old conspiracy running, forming their own splinter group known as "The Outlaws", as opposed to the official "Program".

''The Fall of Delta Green'', on the other hand, is a spin-off set during the 1960s. Focusing on Delta Green's operations during the [[Cold War]], in particular in [[Indochina]] and the [[Vietnam War]], before the fateful operation that led to the original disbandment of the organization.

The group was introduced in the seventh issue of ''The Unspeakable Oath'', a ''Call of Cthulhu'' [[fanzine]] created by Pagan Publishing, in early 1993. Four years later, the ''Delta Green'' supplement appeared and spawned a number of its own [[Adventure (role-playing games)|supplements]] and novels. The premise is similar to ''[[The X-Files]]'' (although the original incarnation of Delta Green preceded ''The X-Files'' by almost a year<ref>{{cite web|url=http://www.delta-green.com/about/faq.html | archive-url=https://web.archive.org/web/20060324085943/http://www.delta-green.com/about/faq.html | url-status=dead | archive-date=March 24, 2006 | title=Frequently Asked Questions About Delta Green|website=www.delta-green.com }}</ref>). Both draw on federal [[Alphabet soup (linguistics)|alphabet soup]] folklore, [[UFO conspiracy theory|UFO conspiracy theories]] and other modern legends.

The ''Delta Green'' supplement lays the groundwork for organized investigations into paranormal crime and horror, setting up the initial plot and providing players with their motivations and the resources they need to carry out their tasks. It also provides a source of replacements for characters who go mad or are killed. Canonical materials revolve around threats from the [[Cthulhu Mythos]], but the framework is very flexible. Delta Green agents typically know little about the Mythos. While the scenarios and written material is centered around the United States, there are possibilities for international games too. ''[[Delta Green: Countdown]]'' introduced counterparts in the United Kingdom and Russia, called PISCES and [[GRU (Russian Federation)|GRU]] SV-8 respectively, as well as real-life international law enforcement and intelligence agencies, while ''Targets of Opportunity'' introduced the Canadian M-EPIC.

==Gameplay==
The original 1997 edition of ''Delta Green'' was a sourcebook for ''[[Call of Cthulhu (role-playing game)|Call of Cthulhu]]''; as such, it used the [[Basic Role-Playing]] system that ''Call of Cthulhu'' had.

The 2016 standalone edition takes the percentile dice of [[Basic Role-Playing]] and ''Call of Cthulhu'' mechanics, and introduces modifications adapted for the setting. [[Player Character]]s are called ''Agents'' and the [[Game master|Game Masters]] ''Handlers''.

''Sanity'' is rolled when characters meet unnatural horrors, as well as in violent situations and moments when the Agents feel helpless. Agents can "adapt" to violence and helplessness after failed Sanity checks, but excessive loss of Sanity can result in agents developing [[Mental disorder|mental disorders]].
Delta Green introduces the concept of ''Bonds'', which are the friends and family of the Agents, and ''Motivations'', the reasons why the Agents fight. The latter serves as a character-expanding tool for players and a sanity-regulation mechanic, as they can be used to halve the SAN loss. At the point of their relationship with bonds, if the relationship points fall, the connection with the bond will be crossed out. With the bond mechanics, the ''Home'' scenes are also introduced. These are between-mission vignettes of the Agents' everyday lives. They can be about building relationships with bonds, investigating the unnatural, or going to the therapists, among others.

Gear and equipment can be requisitioned from the government organizations under which the Agent works, through the use of the ''Bureaucracy'' skill, with more expensive and advanced equipment increasing the difficulty of the roll. A failure might result in the Agent getting fired, blacklisted, or even arrested. Items can also be purchased using the Agent's personal wealth, though this can risk the Agent's relationship with their bonds.

Combat was also streamlined to be quicker, more tactical, and deadly. The main combat mechanic introduced is ''Lethality'', weapons that deal damage above 2d10 have a "lethality rating" from 10% to 90%, if the percentile roll is below the rating the targeted enemy dies instantly; otherwise, the damage dealt is the sum of the percentile dice.<ref>{{cite book |year=2016 |title=Delta Green: Agent's Handbook |publisher=[[Arc Dream Publishing]] |isbn=978-1-940410-21-0}}</ref>

''The Fall of Delta Green'' uses Pelgrane Press' own [[Gumshoe System]] that is also used in their other games such as [[The Esoterrorists]], [[Fear Itself (role-playing game)|Fear Itself]] and [[Trail of Cthulhu]].<ref name="site.pelgranepress.com"/> Unlike the standard D100/[[Basic Role-Playing|BRP]] system that both ''Call of Cthulhu'' and ''Delta Green'' use, in which many actions are subject to D100 rolls to determine outcome, the Gumshoe system emphasizes getting characters from scene to scene quickly, gathering clues and interpreting them using minimal rolls of a 6-sided die.<ref>{{cite web |url=http://site.pelgranepress.com/index.php/gumshoe-rules-summary/ |title = GUMSHOE Rules Summary – Pelgrane Press Ltd| date=September 29, 2017 }}</ref>

''Fall of Delta Green'' also introduces new mechanics for the Gumshoe formula, adapting the new rules introduced by the standalone edition of ''Delta Green'': Bonds and Motivations complement the sanity system (Itself based on the one used in [[Trail of Cthulhu]]), adaptation to SAN loss was included, ''Revelation'' works similarly to the "traumatic background" in Delta Green's character creation and a few new abilities were added, most prominently was the ability of "''Agency''" to represent the capability of the [[Player Character]] to manipulate their employing agency's (Such as the [[CIA]], [[MACV-SOG]] or the [[Federal Bureau of Narcotics]]) resources in their investigations.<ref>{{cite book |year=2018 |title=The Fall of DELTA GREEN|publisher=[[Pelgrane Press]] |isbn=978-1-912324-00-2}}</ref>

==History==
The setting was first introduced in 1992 in the seventh issue of ''[[The Unspeakable Oath]]'', Pagan Publishing's ''Call of Cthulhu'' [[fanzine]], in the scenario ''Convergence'', which would be later republished in the first ''Delta Green'' sourcebook. The scenario introduced Delta Green as a loose organization within the U.S. government dedicated to secretly fight the creatures from the [[Cthulhu Mythos]].<ref>{{cite magazine|last=Tynes |first=Jonh |date=1992 |title=Convergence|magazine=The Unspeakable Oath |location=Seattle |publisher=[[Pagan Publishing]]}}</ref> ''Convergence'' was also followed by a sequel named ''Transference'' published in Volume 2 Issue 2 of the [[Cyberpunk 2020]] [[fanzine]] ''The Interface,'' although later published material disregards this scenario.

Pagan Publishing would then expand the setting resulting in the publishing of the ''Delta Green'' sourcebook in 1997. This was followed an additional sourcebook in 1999 titled ''[[Delta Green: Countdown]]''.<ref>{{Cite web |title=Countdown |url=https://rpggeek.com/rpgitem/45081/countdown |access-date=May 31, 2023 |website=RPGGeek |language=en-US}}</ref>

On May 1, 2006, the Pagan Publishing homepage was updated with an announcement describing the reasons for the delay of the new release of ''Delta Green'', and stating that the [[d20 System|d20]] edition of the game should be available in time for [[Gen Con]] Indy. While there were a few show copies available there were no copies available for sale to the public as most of them were "still being shipped from China".<ref name="Pagan Publishing">[http://www.tccorp.com/pagan/ Pagan Publishing<!-- Bot generated title -->]</ref> As of May 2007 the book, which is a reprint of the 1997 book with the addition of D20 stats, was finally reprinted and was available in stores.<ref name="Pagan Publishing"/>

A hardback compilation of the three ''Delta Green Eyes Only'' chapbooks, along with additional material, was released in November 2007. The book was published in cooperation with [[Arc Dream Publishing]]. The entire 1,000 copy print run was sold out by February 2008.<ref>[http://www.delta-green.com/dgeo/ Delta Green Eyes Only] {{webarchive|url=https://web.archive.org/web/20080225191814/http://www.delta-green.com/dgeo/ |date=February 25, 2008 }}</ref> The hardback edition of ''Delta Green: Eyes Only'' was a finalist for the Origins Award for Best Roleplaying Supplement of 2007. A softback version of the compilation followed in September 2008 and is available to retail distribution.

Pagan Publishing and Arc Dream Publishing began work in mid-2008 on a new sourcebook, ''Delta Green: Targets of Opportunity'', which was released as a limited-edition hardback in June 2010, to be followed by a softcover retail edition.<ref>http://www.arcdream.com/upcoming.php {{Webarchive|url=https://web.archive.org/web/20090123015000/http://arcdream.com/upcoming.php |date=January 23, 2009 }} ArcDream's Upcoming Page</ref><ref>http://www.arcdream.com/store/product.php?id=9999 {{Webarchive|url=https://web.archive.org/web/20100710034934/http://www.arcdream.com/store/product.php?id=9999 |date=July 10, 2010 }} Arc Dream Publishing Online Store</ref> As of August 2011 the entire 1,000-copy print run of the hardback limited edition was sold out. In August 2011, ''Delta Green: Targets of Opportunity'' won silver (2nd place) Ennie Awards for Best Writing and Best Adventure.<ref>{{cite web|url=http://www.ennie-awards.com/blog/wp-content/uploads/2011/08/2011_Winners.pdf|title=2011 Ennie Awards}}</ref>

Arc Dream Publishing released an ebook edition of the novel ''Delta Green: Denied to the Enemy'' in January 2011.<ref>https://www.amazon.com/Delta-Green-Denied-Enemy-ebook/dp/B004JKNQD0/ref=sr_1_2?ie=UTF8&m=AG56TWVU5XWC2&s=digital-text&qid=1295454769&sr=8-2 Amazon.com</ref>

As of October 29, 2015, a [[Kickstarter]] Campaign by Arc Dream Publishing funded a series of new ''Delta Green'' products, converting the setting into a standalone role-playing game.<ref name="kickstarter.com">{{cite web |url=https://www.kickstarter.com/projects/arcdream/delta-green-the-role-playing-game/description |title = Delta Green: The Role-Playing Game by Arc Dream Publishing — Kickstarter}}</ref> On February 26, 2016, a quick-start rulebook ''Delta Green: Need to Know'' was released for free download with the ''Agent's Handbook'' following soon after on April 27, 2016. The ''Handler's Guide'' was released October 31, 2017, in PDF and on March 8, 2018, a compilation of several other ''Delta Green'' adventures released by Arc Dream was released in only one book ''Delta Green: A Night at the Opera'', containing the adventures ''Reverberations'', ''Viscid'', ''Music from a Darkened Room'', ''Extremophilia'', ''Star Chamber'' and ''Observer Effect''.

In February 2018, Pelgrane Press released ''The Fall of Delta Green'', the [[Vietnam War]] game financed on the 2015 Kickstarter as a [[Gumshoe System|GUMSHOE]] counterpart to Delta Green's [[Basic Role-Playing]].<ref>{{cite web |url=http://www.delta-green.com/2018/01/the-fall-of-delta-green-in-pdf/ |title = Delta Green » The Fall of Delta Green in PDF!}}</ref><ref name="kickstarter.com"/><ref name="site.pelgranepress.com"/>

On July 9, 2018, returning co-creator John Scott Tynes started a Kickstarter campaign to fund ''Delta Green: The Labyrinth'', a new sourcebook containing "new threats, allies, and mysteries to deepen the terrors of your campaign."<ref>{{cite web |url=https://www.kickstarter.com/projects/arcdream/delta-green-the-labyrinth/description |title = Delta Green: The Labyrinth by Arc Dream Publishing — Kickstarter}}</ref> It was released on November 12, 2019, in PDF and July 29, 2020, in physical format.

In 2018, ''Delta Green'' won six [[ENnies|ENnies awards]]. Gold in ''Best Rules'', ''Best Production Values'' for ''Delta Green: The Roleplaying Game'' and ''Best E-Book'' for ''Delta Green: A Night at The Opera'' categories; while Silver in ''Product of the Year'' and ''Best Game'' for ''Delta Green: The Roleplaying Game'' and ''Best Adventure'' for ''Delta Green: A Night at The Opera''.

On April 18, 2019, the sourcebook ''Delta Green: The Complex'' was released, containing information on federal agencies and related professions that didn't appear in the ''Agent's Handbook'', such as the [[Bureau of Alcohol, Tobacco, Firearms and Explosives|ATF]], [[NSA]], [[Booz Allen Hamilton]], [[United States Coast Guard]] among other federal law enforcement, intelligence, military and [[private contractor]]s agencies that work for the US government.<ref>{{Cite web|url=http://www.delta-green.com/2019/04/delta-green-the-complex-now-available/|title="Delta Green: The Complex" Now Available|date=April 18, 2019|website=Delta Green|language=en-US|access-date=April 25, 2019}}</ref> Later on April 24, the collection of scenarios ''Delta Green: Control Group'' was released in PDF format,<ref>{{Cite web|url=http://www.delta-green.com/2019/04/download-control-group-now/|title=Download "Control Group" Now|date=April 24, 2019|website=Delta Green|language=en-US|access-date=April 25, 2019}}</ref> the scenarios in ''Control Group'' are meant to be introductory for both players and their characters, the scenarios use pre-made characters that are not in the Delta Green conspiracy. 2020 saw the release of ''Black Sites'', similar to ''A Night at The Opera'', it's a hardback collection of scenarios previously available only in PDF or paperback.<ref>{{Cite web|date=July 26, 2021|title=ARCHINT now available for Delta Green|url=https://www.delta-green.com/2021/07/archint-now-available-for-delta-green/|access-date=September 16, 2021|website=Delta Green|language=en-US}}</ref>

On January 25, 2021 ''Delta Green: Impossible Landscapes'' was released. It is ''Delta Green'''s first full-length campaign, centered around [[Hastur]], [[The King in Yellow]] and [[Carcosa]], with a bigger focus in [[Surrealism|surreal]] horror.<ref>{{Cite web|date=January 25, 2021|title='Delta Green: Impossible Landscapes' Flowers in Your Mind in PDF|url=http://www.delta-green.com/2021/01/delta-green-impossible-landscapes-flowers-in-your-mind-in-pdf/|access-date=January 29, 2021|website=Delta Green|language=en-US}}</ref>

On August 10, 2021, Arc Dream started yet another Kickstarter campaign called ''Delta Green: The Conspiracy''. The project is an updated re-release of the original ''Delta Green'' sourcebook (now retitled ''Delta Green: The Conspiracy'') with new art, layout and aligned with the new edition's rules. The campaign was a success and it raised $513,158, more than any previous campaign.<ref>{{Cite web|date=August 11, 2021|title=Fans flock to the 25th-anniversary edition of Delta Green, the conspiracy horror RPG|url=https://www.geeknative.com/134111/fans-flock-to-the-25th-anniversary-edition-of-delta-green-the-conspiracy-horror-rpg/|access-date=September 17, 2021|website=Geek Native|language=en-GB}}</ref><ref>{{Cite web|date=August 11, 2021|title=Horror RPG sourcebook Delta Green celebrates 25th anniversary with a new edition|url=https://www.dicebreaker.com/games/delta-green-the-roleplaying-game/news/delta-green-rpg-25th-anniversary|access-date=September 17, 2021|website=Dicebreaker|language=en}}</ref> Beside the original sourcebook, the campaign also funded the rest of the original line of Pagan Publishing sourcebooks: ''Delta Green: Countdown'' (as ''Delta Green: The Millennium'') and ''Delta Green: Eyes Only'' (as ''Delta Green: Machinations''). ''Targets of Opportunity'' was divided in two books: ''Legacies,'' with the chapters of the Black Cod Island, M-EPIC, the Disciples of the Worm, and the DeMonte Clan, and ''Transcendence'' with the chapters of Cult of Trascendence. The scenarios in the original sourcebooks won't be released with the new ones; instead they will be released separately as paperback and then in one hardcover book called ''Delta Green: Incursions.'' ''Delta Green: Agencies'' will contain the U.S. and international agencies profiled in the annex of ''Delta Green'' and ''Countdown.'' The only new material will be ''Delta Green: Shotgun Scenarios''. A "shotgun scenario" is a short standalone scenario that can fit into other, larger campaigns or scenarios. Many of them will be fan-made, coming from the community-run Shotgun Scenarios fan contest.<ref>{{Cite web |title=Pre-order Delta Green: The Conspiracy on BackerKit |url=https://deltagreentheconspiracy.backerkit.com/hosted_preorders |access-date=July 20, 2022 |website=BackerKit |language=en}}</ref>

April 2022 saw the release of ''Iconoclasts'', Delta Green's second campaign. It is set in 2016 during [[war against the Islamic State]] in Iraq, tasking players to infiltrate and investigate mysterious events going on inside the territory of the [[Islamic State of Iraq and Syria]].<ref>{{Cite web |title=Delta Green » Delta Green: Iconoclasts Available in PDF |work=Delta Green |date=April 26, 2022 |url=https://www.delta-green.com/2022/04/delta-green-iconoclasts-available-in-pdf/ |access-date=July 20, 2022 |language=en-US}}</ref><ref>{{Cite web |title=Delta Green: Iconoclasts - Arc Dream Publishing {{!}} Delta Green {{!}} DriveThruRPG.com |url=https://www.drivethrurpg.com/product/394624/Delta-Green-Iconoclasts |access-date=July 20, 2022 |website=www.drivethrurpg.com |language=en}}</ref>

On October 13, 2023 Delta Green's third campaign ''God's Teeth'' was released. The campaign is set in 2001 and plays out over a 19 year timespan.<ref>{{Cite web |title=DriveThruRPG |url=https://www.drivethrurpg.com/en/product/455923/delta-green-god-s-teeth |access-date=2024-10-24 |website=www.drivethrurpg.com}}</ref><ref>{{Cite web |title=Delta Green: God's Teeth (hardback) |url=https://shop.arcdream.com/products/delta-green-gods-teeth-hardback |access-date=2024-10-24 |website=Arc Dream Publishing |language=en}}</ref>

=== International publishing ===
In 2024, Brazilian publisher RetroPunk started a crowdfunding campaign for the [[Brazilian Portuguese]] edition of Delta Green.<ref>{{Cite web |title=Projeto Delta Green BR |url=https://loja.retropunk.com.br/index.php?id_product=777&rewrite=projeto-delta-green-br&controller=product |access-date=May 5, 2024 |website=RetroPunk Publicações |language=pt-BR}}</ref>

==Publications==

===Pagan Publishing game books===
* ''Delta Green'' (February 1, 1997), the basic sourcebook; {{ISBN|1-887797-08-4}}.
* ''[[Delta Green: Countdown]]'' (1999), the 2000s sourcebook, by John Tynes, Dennis Detwiller and Adam Scott Glancy, {{ISBN|1-887797-12-2}}.
* ''Delta Green Eyes Only Volume 1: Machinations of the Mi-go'' {{ISBN|1-887797-13-0}}.
* ''Delta Green Eyes Only Volume 2: The Fate''.
* ''Delta Green Eyes Only Volume 3: Project Rainbow'' {{ISBN|1-887797-21-1}}.
* ''Delta Green'' (May 2007), the basic sourcebook with dual BRP/[[d20 System|D20]] stats; {{ISBN|1-887797-23-8}}.
* ''Delta Green: Eyes Only'' (November 2007), a compilation of the ''Eyes Only'' chapbooks with additional material; {{ISBN|1-887797-27-0}}.
* ''Delta Green: Targets of Opportunity'' (2010), a sourcebook detailing five new evils, by Warren Banks, Dennis Detwiller, Adam Scott Glancy, Kenneth Hite, [[Shane Ivey]], and Greg Stolze, illustrated by Todd Shearer; {{ISBN|1-887797-31-9}}.

===Arc Dream Publishing sourcebooks===
* ''Delta Green: Need to Know with Handler's Screen'' (April 27, 2016, PDF; August 1, 2016, Print), by Shane Ivey and Bret Kramer; {{ISBN|978-1940410203}}
* ''Delta Green: Agent's Handbook'' (Hardback) (April 27, 2016, PDF; August 1, 2016, Print), players-only core rulebook; {{ISBN|1-940410-21-5}}
* ''Delta Green: Handler's Guide'' (Hardback) (October 31, 2017, PDF; July 1, 2018, Print), the [[Game Master]]-only book with lore information and enemy statistics; by Dennis Detwiller, Adam Scott Glancy, Kenneth Hite, Shane Ivey, Greg Stolze; {{ISBN|978-1-940410-28-9}}
* ''Delta Green: Delta Green: The Role-Playing Game (Slipcase)'' (March 9, 2018, PDF; July 23, 2018, Print), by Dennis Detwiller; Adam Scott Glancy; Kenneth Hite; Shane Ivey; Greg Stolze (Author); {{ISBN|978-1940410326}}
* ''Delta Green: Need to Know (Quickstart Rulebook Only)'' (November 6, 2018), by Shane Ivey and Bret Kramer; {{ISBN|978-1729257623}}
* ''Delta Green: The Complex'' (Paperback) (April 18, 2019, PDF; POD); by Christopher Gunning; {{ISBN|978-1-940410-41-8|}}
* ''Delta Green: The Labyrinth'' (Hardback) (November 12, 2019, PDF), sourcebook with new enemy groups and allies; by John Scott Tynes; {{ISBN|978-1940410487|}}
* ''Delta Green: STATIC Protocol'' (Paperback) (February 24, 2021, PDF; POD), supplement for Impossible Landscapes; by Dennis Detwiller
* ''Delta Green: ARCHINT'' (Paperback) (July 26, 2021, PDF; POD), collection of artifacts; by Dennis Detwiller, Caleb Stokes; {{ISBN|978-1-940410-58-6}}
* ''Delta Green: The Conspiracy'' (Hardback) (October 26, 2022, PDF), revised sourcebook for running Delta Green in the 1990s; by Dennis Detwiller, Adam Scott Glancy, and John Scott Tynes; ISBN 978-1-940410-61-6

===Arc Dream Publishing scenarios===
* ''Delta Green: The Last Equation'' (Paperback) (April 4, 2011, PDF; POD), by Dennis Detwiller; {{ISBN|978-1940410333|}}
* ''Delta Green: Kali Ghati'' (Paperback) (April 27, 2016, PDF; POD), scenario by Shane Ivey; {{ISBN|978-1-940410-24-1|}}
* ''Delta Green: Lover in the Ice'' (May 27, 2016, PDF), PDF scenario by Caleb Stokes
* ''Delta Green: The Star Chamber'' (Paperback) (July 25, 2016, PDF; POD), scenario by Greg Stolze; {{ISBN|978-1-940410-26-5|}}
* ''Delta Green: Observer Effect'' (Paperback) (December 13, 2016, PDF; POD); {{ISBN|978-1-940410-25-8}}
* ''Delta Green: Extremophilia'' (Paperback) (September 21, 2017, PDF, POD), by Shane Ivey; {{ISBN|978-1-940410-27-2}}
* ''Delta Green: Music From a Darkened Room'' (Paperback) (October 18, 2017, PDF; POD), by Shane Ivey; {{ISBN|978-1-940410-29-6}}
* ''Delta Green: Viscid'' (Paperback) (January 2, 2018, PDF; POD), by Dennis Detwiller; {{ISBN|978-1940410302}}
* ''Delta Green: A Night at the Opera'' (Hardback) (March 8, 2018, PDF; November 30, 2018, Print), by Dennis Detwiller, Shane Ivey, Greg Stolze; {{ISBN|978-1940410319}}
* ''Delta Green: Sweetness'' (Paperback) (March 27, 2018, PDF; POD), by Dennis Detwiller; {{ISBN|978-1940410388|}}
* ''Delta Green: Control Group'' (Hardback) (April 24, 2019, PDF; August 19, 2019, Print), A collection of original adventures to introduce players to Delta Green; by Shane Ivey, Greg Stolze; {{ISBN|978-1-940410-44-9|}}
* ''Delta Green: A Victim of the Art'' (Paperback) (June 11, 2019, PDF; POD), by Dennis Detwiller; {{ISBN|978-1940410388|}}
* ''Delta Green: Black Sites'' (Hardback) (April 2020 PDF and Print), by Dennis Detwiller, Adam Scott Glancy, Shane Ivey, Caleb Stokes; {{ISBN|9781940410494}};
* ''Delta Green: Impossible Landscapes'' (Hardback) (January 21, 2020, PDF); by Dennis Detwiller; {{ISBN|978-1940410548|}}
* ''Delta Green: PX Poker Night'' (Paperback) (August 10, 2020, PDF; POD), by Dennis Detwiller, Adam Scott Glancy; {{ISBN|978-1-940410-53-1}}
* ''Delta Green: Hourglass'' (Paperback) (February 4, 2021, PDF; POD), by Shane Ivey; {{ISBN|978-1-940410-50-0}}
* ''Delta Green: Jack Frost'' (Paperback) (September 3, 2021, PDF; POD), by Shane Ivey; {{ISBN|978-1-940410-52-4}}
* ''Delta Green: Iconoclasts'' (Paperback) (April 26, 2022, PDF; POD), by Adam Scott Glancy; {{ISBN|978-1-940410-43-2}}
* ''Delta Green: Convergence'' (Paperback) (March 1, 2023, PDF; POD), by John Scott Tynes; {{ISBN|978-1-940410-63-0}}
* ''Delta Green: From the Dust'' (Paperback) (April 24, 2023, PDF; POD), by Dennis Detwiller; {{ISBN|978-1-940410-64-7}}
* ''Delta Green: Presence'' (Paperback) (May 30, 2023, PDF; POD), by Shane Ivey; {{ISBN|978-1-940410-68-5}}
* ''Delta Green: God's Teeth'' (Hardcover) (October 13, 2023, PDF), by Caleb Stokes; {{ISBN|978-1-940410-60-9}}
* ''Delta Green: Puppet Shows & Shadow Plays'' (Paperback) (December 11, 2023, PDF; POD), by Adam Scott Glancy; {{ISBN|978-1-940410-72-2}}
* ''Delta Green: Meridian'' (Paperback) (April 2, 2024, PDF; POD), by Shane Ivey; {{ISBN|978-1-940410-74-6}}
* ''Delta Green: Dead Letter'' (Paperback) (June 3, 2024, PDF; POD), by Adam Scott Glancy; {{ISBN|978-1-940410-75-3}}
* ''Delta Green: The Good Life'' (Paperback) (June 24, 2024, PDF; POD), by John Scott Tynes; {{ISBN|978-1-940410-76-0}}
* ''Delta Green: Dead Drops'' (Hardback) (July 11, 2024, PDF), by Dennis Detwiller, Shane Ivey; {{ISBN|978-1-940410-81-4}}
* ''Delta Green: God's Eye'' (Paperback) (July 20, 2024, PDF; POD), by Caleb Stokes; {{ISBN|978-1-940410-77-7}}
* ''Delta Green: God's Breath'' (Paperback) (September 10, 2024, PDF; POD), by Caleb Stokes; {{ISBN|978-1-940410-78-4}}

===''The Fall of Delta Green'', by Pelgrane Press===
* ''The Fall of Delta Green'' (February 2018); {{ISBN|978-1-912324-00-2}}
* ''The Borellus Connection'' (September 2024); {{ISBN|978-1-912324-31-6}}

=== Additional material by the original creators ===

Scenarios by [[Dennis Detwiller]], published online and (since Sep 2014) through [[Patreon]]:

* ''Music from a Darkened Room'' (2005)
* ''The Last Equation'' (2010)
* ''Future/Perfect'' (parts 1 through 4 as of 2012)
* ''Viscid'' (January 31, 2016)
* ''Sweetness'' (February 28, 2016)

[[Adam Scott Glancy]] wrote a regular column titled "Directives from A-Cell" in the first six issues of ''Worlds of Cthulhu'' magazine. The column was then transferred to ''[[The Unspeakable Oath]]'' from [[Arc Dream Publishing]], starting with issue 20. The latter magazine has featured a lot of Delta Green-related articles since 1993.

=== Other publishers ===

[[Fantasy Flight Games]] [[LARP|Live Action RPG]] supplements:
* ''Cthulhu Live: Shades of Gray'' (2000); {{ISBN|1-887911-92-8}}.
* ''Cthulhu Live: Delta Green'' (2000); {{ISBN|1-887911-43-X}}.

[[Ronin Arts]]:
* ''Dubious Shards'' by [[Kenneth Hite]] (2006).

[[Pyramid Magazine]]:

* ''Green Box'' (8/21/02 & 10/9/02), with d20 stats.
* ''Jack Frost'' by [[Shane Ivey]] (12/24/99 & 12/31/99), a scenario.

[[Dungeon Magazine]]:

* ''PX Poker Night'' (issue 96), scenario with d20 stats.

[[Shadis]]:

* ''Dia de Los Muertos'', issue 52.

===Fiction===
* ''Delta Green: Alien Intelligence'' (Tynes Cowan Corp, March 1998), anthology, {{ISBN|1-887797-09-2}}.
* ''Delta Green: The Rules of Engagement'' (Tynes Cowan Corp, 2000), novel by John Tynes, {{ISBN|1-887797-16-5}}.
* ''Delta Green: Dark Theatres'' (Armitage House, 2001), anthology, {{ISBN|1-887797-17-3}}.
* ''Delta Green: Denied to the Enemy'' (Tynes Cowan Corp, distributed by Impressions, 2003), novel by Dennis Detwiller, {{ISBN|1-887797-24-6}}.
** Ebook edition (Arc Dream Publishing, 2011), {{ISBN|978-0-9832313-0-1}}.
* ''Delta Green: Through a Glass, Darkly'' ebook edition (Arc Dream Publishing, 2011), novel by Dennis Detwiller, {{ISBN|978-0-9832313-6-3}}.
* ''Delta Green: Strange Authorities'' (Arc Dream Publishing, 2012), collection of previously published fiction by John Tynes, {{ISBN|978-0-9853175-0-8}}.
* ''Delta Green: Tales from Failed Anatomies'' (Arc Dream Publishing, 2014), collection of short stories by Dennis Detwiller. {{ISBN|978-1-940410-08-1}} (hardback edition).
** Paperback edition, {{ISBN|978-1-940410-07-4}}.
** Ebook edition, {{ISBN|978-1-940410-09-8}}.
* ''Delta Green: Extraordinary Renditions'' (Arc Dream Publishing, 2015), anthology.
* ''Delta Green: The Way It Went Down'' (Arc Dream Publishing, 2018), collection of short stories by Dennis Detwiller. {{ISBN|978-1-940410-36-4}} (hardback edition)
** Paperback edition, {{ISBN|978-1-940410-35-7}}
** Ebook edition, {{ISBN|978-1-940410-34-0}}
*''Delta Green: The Way It Went Down, Vol. 2'' (Arc Dream Publishing, 2023), collection of short stories by Dennis Detwiller. ISBN 978-1-940410-66-1 (paperback edition)
**Ebook edition, ISBN 978-1940410654

==Reception==
In the March 1997 edition of the British game magazine ''Arcane'' (Issue 17), Andy Butcher said "Right from the first page of the book, it's obvious that ''Delta Green'' is something really special." Butcher complimented the book for "a wealth of rich detail, intricate plotting, and great imagination. The result is truly inspiring." He concluded by giving the book at excellent rating of 9 out of 10, saying, "One of the biggest, most detailed, best conceived and inspiring sourcebooks ever released for any game system. An absolute must for any ''Call of Cthulhu'' referee considering a modern-day campaign, and highly recommended even if you're not."<ref name="arcane">{{cite journal|last=Butcher|first=Andy | date=March 1997 |title=Delta Green|journal=[[Different Worlds]]|publisher=[[Future Publishing]]|issue=17|pages=55–56}}</ref>

In the July 1998 edition of ''[[Dragon (magazine)|Dragon]]'' (Issue 249), [[Ray Winninger]] called ''Delta Green''  "one of the richest,  most detailed, and most complete sourcebooks ever published." Winninger found that this book "successfully melds Lovecraft's eerie mythos with modern UFO and conspiracy folklore to produce a compelling hybrid setting all its own." Winninger gave the book a perfect rating of 6 out of 6, concluding, "The book contains all the material any Keeper could possibly expect, all of it first rate: the illustrations are excellent and helpful, the included adventures are top-notch, and the price is remarkably reasonable [...] Products like this come along only very rarely. For ''Call of Cthulhu'' fans, ''Delta Green'' is a must buy. For everybody else, it's still probably worth a look."<ref name=dragon249>{{cite journal|last=Winninger|first=Ray|author-link=Ray Winninger| date=July 1998 |title=Role-playing Reviews|journal=[[Dragon (magazine)|Dragon]]|publisher=[[TSR (company)|TSR, Inc.]]|issue=249|pages=110–111}}</ref>

In Issue 3 of the French game magazine ''Backstab'', Stéphane Bura wrote, "Seldom has a role-playing product inspired in me such a sense of despair and helplessness in the face of the threat it offered." He concluded by giving the book a perfect rating of 10 out of 10, saying, "Even if you wouldn't normally play a contemporary role-playing game, buy this supplement anyway. This is the must-see product that will set the bar for excellence for a few years to come."<ref name="bs">{{cite magazine|last=Bura|first=Stéphane  |  date=January–February 1997 |title=Critiques|magazine=Backstab|issue=3|pages=49|publisher = FC Publications | url =https://archive.org/details/backstab-magazine-french-03/page/n47/mode/2up | access-date=July 21, 2021|language=fr}}</ref>

In his 2023 book ''Monsters, Aliens, and Holes in the Ground'', RPG historian Stu Horvath noted, "A rich narrative web increases the horror for the players, even if the players don't experience the full story. There is a thrill to combing through the histories and timelines, making connections, and developing theories." Horvath concluded, "''Delta Green'' more often pits players against other humans, rather than monsters, which, in turn, places an increased value on examining the human toll of the missions ... It doesn't always ring true, but it represents a vast improvement over sanity systems that feature pulp-inspired caricatures of mental health."<ref name=mahg>{{cite book| last = Horvath| first = Stu| title = Monsters, Aliens, and Holes in the Ground| publisher = MIT Press| date = 2023| location = Cambridge, Massachusetts| pages = 252–256| isbn =9780262048224 }}</ref>

==Awards==
===Origins Awards===
*At the 1998 [[Origins Awards]], ''Delta Green'' won "Best Roleplaying Supplement of 1997".<ref>{{cite web |url=http://www.originsgamefair.com/awards/1997/list-of-winners  |title=Origins Award Winners (1997)  |publisher=Academy of Adventure Gaming Arts & Design  |access-date=June 3, 2008  |archive-url=https://web.archive.org/web/20080331064621/http://www.originsgamefair.com/awards/1997/list-of-winners  |archive-date=March 31, 2008  |url-status=dead  }}</ref> 
*At the 2000 Origins Awards, the setting won two awards:{{cn|date=January 2022}} 
**Best Game-Related Novel of 1999 for ''Delta Green: The Rules of Engagement'' 
**Best Roleplaying Supplement of 1999 for ''Delta Green: Countdown''

===ENnie Awards===
*At the 2010 [[ENnie Awards]], ''Delta Green: Targets of Opportunity'' was awarded two silvers in the categories "Best Adventure" and "Best Writing."<ref>{{cite web | url =http://ogrecave.com/2010/08/06/2010-ennie-awards-winners-announced/ | title =2010 ENnie Awards Winners Announced | date =August 6, 2010 | website =ogrecave.com | access-date =December 11, 2020}}</ref> 
*At the 2016 awards: 
**''Delta Green: Agent’s Handbook'' was awarded a silver in "Best Supplement" 
**''Delta Green: Need to Know'' won gold in "Best Free Game".<ref>{{cite web | url =https://boardgamegeek.com/blogpost/56586/ennie-award-winners-2016 | title =Ennie Award Winners 2016!! | date =August 6, 2016 | website =boardgamegeek.com | access-date =December 11, 2020}}</ref> 
*At the 2018 awards:
**''Delta Green: The Role-Playing Game'' won two golds in "Best Rules" and "Best Production Values", and the silver in "Best Game" and "Product of the Year"
**''Delta Green: A Night at the Opera'' won the gold in "Best Electronic Book" and the silver in "Best Adventure".<ref>{{cite web | url =https://www.enworld.org/threads/congratulations-to-2018s-ennie-award-winners.665616/ | title =Congratulations to 2018's ENnie Award Winners! | date =August 4, 2018 | website =enworld.org | access-date =December 11, 2020}}</ref> 
*At the 2019 awards, ''The Fall of Delta Green'' won the gold in "Best Setting."<ref>{{cite web | url =https://boardgamegeek.com/blogpost/93106/ennie-award-winners-201 | title =Ennie Award Winners 2019! | date =August 3, 2019 | website =boardgamegeek.com | access-date =December 11, 2020}}</ref> 
*At the 2020 awards, ''Delta Green: The Labyrinth'' won the gold in "Best Supplement."<ref>{{cite web | url =https://ennie-awards.com/2020-nominees_winners/ | title =ENnies: 2020 Nominees and Winners | website =ennie-awards.com | access-date =December 11, 2020 | archive-date =December 24, 2020 | archive-url =https://web.archive.org/web/20201224055235/https://ennie-awards.com/2020-nominees_winners/ | url-status =dead }}</ref>
*At the 2022 awards, ''Delta Green: Impossible Landscapes'' won the gold in "Best Layout and Design."<ref>{{Cite web |title=2022 Results – ENNIE Awards |url=https://ennie-awards.com/2022-results/ |access-date=August 21, 2022 |language=en-US}}</ref>
*At the 2024 awards, ''Delta Green: God’s Teeth'' won the gold in "Best Adventure – Long Form."<ref>{{Cite web |title=2024 Winners & Nominees – ENNIE Awards |url=https://ennie-awards.com/2024-nominees/ |access-date=August 26, 2024 |language=en-US}}</ref>

==Other reviews==
*''[[Valkyrie (magazine)|Valkyrie]]'' #15 (1997)
*''[[Shadis]]'' #35 (1997)
*''[[Pyramid (magazine)|Pyramid]]'' #25 (May/June 1997)
*''Backstab'' #15<ref>{{Cite web|url=https://archive.org/details/backstab-magazine-french-15/page/n37/mode/2up|title = Backstab Magazine (French) Issue 15}}</ref>
*''[[SF Site]]''<ref>{{cite web |url=https://www.sfsite.com/04b/delt55.htm |title = The SF Site Featured Review: Delta Green}}</ref>
*''[[Pyramid (magazine)|Pyramid]]''<ref>{{Cite web|url=http://www.sjgames.com/pyramid/sample.html?id=6772|title = Pyramid: Pyramid Pick: Delta Green: A Call of Cthulhu Sourcebook of Modern Horror and Conspiracy (For Call of Cthulhu and Call of Cthulhu d20)}}</ref>

==See also==
The following novels and short stories share similar backgrounds to Delta Green:

*''[[The Atrocity Archives]]'' and its sequels by [[Charles Stross]]
*''[[The Spiraling Worm]]'' by [[David Conyers]] and [[John Sunseri]]
*''[[Declare]]'' by [[Tim Powers]]
* Tinfoil Trilogy by ''[[Caitlin R. Kiernan]]''

Other role-playing games with similar premise:

* ''[[Bureau 13]]''
* ''[[Conspiracy X]]''
* ''[[Hunter: The Vigil]]''
* ''[[Night's Black Agents (role-playing game)|Night's Black Agents]]''

==References==
<references/>

==External links==
* {{official|url=http://www.delta-green.com/}}

[[Category:Basic Role-Playing System]]
[[Category:Campaign settings]]
[[Category:Cthulhu Mythos role-playing games]]
[[Category:Horror role-playing games]]
[[Category:Espionage role-playing games]]
[[Category:Origins Award winners]]
[[Category:Role-playing games introduced in 1997]]
[[Category:Contemporary role-playing games]]
[[Category:Fiction set in the 1990s]]
[[Category:Fiction set in the 2010s]]
[[Category:Fictional paranormal investigation agencies]]