Editing Mostly Harmless (section)

{{short description|1992 comic science fiction novel by Douglas Adams}}
{{about|the book|the catch phrase|Phrases from The Hitchhiker's Guide to the Galaxy|the deceased hiker|Mostly Harmless (hiker)}}
{{Use British English|date=May 2019}}
{{Use dmy dates|date=October 2024}}
{{Infobox book
|name          = Mostly Harmless
|title_orig    =
|translator    =
|image         = Mostly Harmless Harmony front.jpg
|caption       = First edition (UK)
|author        = [[Douglas Adams]]
|illustrator   =
|cover_artist  = 
|country       = United Kingdom, United States
|language      = English
|series        = ''[[The Hitchhiker's Guide to the Galaxy]]''
|subject       =
|genre         = [[Comic science fiction]]
|publisher     = [[William Heinemann]] (UK)<br>[[Harmony Books]] (US)
|release_date  = 1992
|media_type    = Print ([[Hardcover]] and [[Paperback]])
|pages         = 229, UK paperback; 240, US paperback
|isbn          = 0-330-32311-3
|oclc= 29469448
|preceded_by   = [[So Long, and Thanks for All the Fish]]
|followed_by   = [[And Another Thing... (novel)|And Another Thing...]]
}}

'''''Mostly Harmless''''' is a 1992 novel by [[Douglas Adams]] and the fifth book in the ''[[Hitchhiker's Guide to the Galaxy]]'' series. It is described on the cover of the first edition as "The fifth book in the increasingly inaccurately named Hitch Hiker's Guide to the Galaxy trilogy". It was the last ''Hitchhiker's'' book written by Adams and his final book released in his lifetime.