Editing Megastructure (section)

===Planetary and orbital scale===

* Several structures from the fictional ''[[Halo (series)|Halo]]'' universe:
** The original twelve [[Halo (megastructure)|Halos]], seen in ''[[Halo: Cryptum]]'', were 30,000 kilometers in diameter; a separate array of six Halos are 10,000 kilometers in diameter, with one of the original twelve later being reduced to this size in ''[[Halo: Primordium]]''.
** The Lesser Ark is a 127,530&nbsp;km diameter structure from which the Halo Array can be activated and capable of building 10,000&nbsp;km Halos. The "greater" Ark, seen in ''Cryptum'' and ''Primordium'', is capable of producing 30,000&nbsp;km Halos. 
** Onyx is an artificial planet made entirely out of Forerunner Sentinels (advanced replicating robots). At its core is a "shield world", contained within [[Slipstream (science fiction)|slipstream]] space, that is approximately one [[astronomical unit]] in diameter. The much smaller Shield World 0459, (approximately 1,400&nbsp;km in diameter), is the setting for the latter half of ''[[Halo Wars]]''. A third shield world, Requiem, is the primary setting for ''[[Halo 4]]''.  Requiem is an artificial hollow planet encased in a kind of Dyson Sphere. ''[[Halo 5: Guardians]]'' introduces a fourth shield world, Genesis.
** ''High Charity'', the Covenant's mobile planetoid station.
*In the ''[[Doctor Who]]'' episodes ''[[The Stolen Earth]]'' and [[Journey's End (Doctor Who)|''Journey’s End'']], a planet-sized space station known as The Crucible is built by the Daleks, a genocidal alien race, and facilitates the reality bomb, a weapon meant to erase the entire multiverse from existence. The Crucible also held enough Daleks to slaughter the universe they were in even without the bomb, according to [[The Doctor (Doctor Who)|The Doctor]].
* In ''[[Sonic Adventure 2]]'' and ''[[Shadow The Hedgehog (video game)|Shadow The Hedgehog]]'', the Eclipse Cannon is a planet-destroying WMD built inside of the Space Colony Ark. 
* [[Buster Machine III]] from ''[[Gunbuster]]''.
* The [[Orbital (The Culture)|Culture Orbital]] from ''[[The Culture]]''.
* In the 2013 CGI [[anime]] film, ''[[Space Pirate Captain Harlock (film)|Space Pirate Captain Harlock]]'', the Jovian Accelerator is an ancient, Death Star-like [[weapons of mass destruction|Weapon of mass destruction]] that uses energy from [[Jupiter|Jupiter's]] atmosphere to create a large beam of intense light strong enough to destroy an entire planet.
* [[Knights of Sidonia|Sidonia]], the main ship and home of millions of humans, 1000 years in the future in the Knights of Sidonia manga and anime series, created after the destruction of the earth along with other unnamed seed ships.
* [[Trantor]], the capital of an interstellar empire in [[Isaac Asimov]]'s [[Foundation (book series)|Foundation series]], is an [[ecumenopolis]], a planet entirely covered in one huge metal-clad building, with only one small green space: the Emperor's palace grounds.
* The [[Ori (Stargate)|Ori]] [[Supergate (Stargate)|Supergate]] seen in a number of episodes of ''[[Stargate SG-1]]'' could be classed as a megastructure.
* In ''[[The Hitchhiker's Guide to the Galaxy]]'' series, Earth, as well as other planets, were artificial megastructures. Earth was intended to function as a gigantic computer and was built by a race of beings who made their living by manufacturing other planets.
* Mata-Nui in the ''[[BIONICLE]]'' franchise is classifiable as a megastructure. In the story, he is a massive robot as tall as a planet, and inside his body, every inhabitant of the BIONICLE Universe (Matoran, [[Toa (Bionicle)|Toa]], etc.) all live, unaware that they live inside a massive, space-traveling entity.
* In the ''[[Robotech]]'' Sentinels novels, Haydon IV is an artificially constructed cyber-planet with android citizens.
* In the ''[[Invader Zim]]'' episode "[[Planet Jackers]]", two aliens surround the Earth with a fake sky in order to throw it into their sun.
* In the 2017 video game ''[[Destiny 2]]'', the fleet of Dominus Ghaul, the ruler of the Cabal Empire, features a massive super-weapon named the ''Almighty'', whose wingspan is said to be as wide as the planet [[Mercury (planet)|Mercury]]. ''Almighty'' links itself to a planetary system's star on the quantum level via an energy beam and breaks it down into usable fuel, warping to another system before the star collapses into a supernova. 
* [[Nightmare (Kirby)|Nightmare]]'s fortress from ''[[Kirby: Right Back at Ya!]]'' can be classified as a megastructure because it is the size of a small planet.
* In several works, Arthur C. Clarke writes about a colossal hollow tube, first described in ''[[Rendezvous with Rama]]'' (1973), and inhabited by different races.
* The Citadel in the ''[[Mass Effect]]'' universe is an enormous space station constructed by an ancient race of machines called the Reapers millions of years before the games in the series. At the time of ''[[Mass Effect 2]]'', its population is 13.2 million.
* In the game ''[[Airforce Delta Strike]]'' a large Space Elevator called the Chiron Lift is used to send supplies out into outer space.
* In the game ''[[Half-Life 2]]'', an alien empire, the [[Combine (Half-Life)|Combine]], invaded earth through the border world Xen. After the combine invaded earth in an event named the ''Seven Hour War'', they created a large tower 2.5 miles tall, the ''Combine Citadel''.
* In the ''[[Warhammer 40,000]]'' series, the Imperial Palace (site of the Golden Throne wherein the Emperor of Mankind is kept alive indefinitely) could be considered a megastructure. The palace is a complex of continent-wide structures with the Golden Throne being located in an area stretching across the whole of the Himalayan mountains.
* In the film ''[[Elysium (film)|Elysium]]'', a luxury space station (a [[Bishop Ring (habitat)|Bishop Ring]]) called Elysium houses the wealthy population of the human species.
* Large rotating space-stations are a staple of science fiction, including [[Arthur C. Clarke]]'s novel ''[[2001: A Space Odyssey (novel)|2001: A Space Odyssey]]'', the battle school from ''[[Ender's Game]]'', and the eponymous ''[[Babylon 5 (fictional space station)|Babylon 5]]''.
* Hollowed asteroids feature in various fiction, such as [[Kim Stanley Robinson]]'s novel ''[[2312 (novel)|2312]]'', [[Larry Niven]]'s ''[[Known Space]]'', and Golden Age SF writers like Clarke and Asimov.
* In the 2022 film ''[[Moonfall (film)|Moonfall]]'', Earth's moon is knocked from its orbit and begins to circle closer to Earth. A conspiracy theorist believes the Moon is a Dyson sphere megastructure and turns out to be correct.