The games, novels and short stories of Warhammer 40,000 take place in a dystopic science-fantasy universe with most stories set in the last days of the 41st Millennium, over 38,000 years in the future, where Mankind has settled more than a million worlds across the known galaxy. Most of humanity is united under the Imperium of Man, a brutal theocratic regime united in its worship of the divine Emperor of Mankind. Despite its size and power, the Imperium teeters on the brink of collapse due to a combination of escalating war, corruption, bureaucratic inefficiency, and technological stagnation. For as long as there has been a Warhammer 40,000 hobby, there have been unofficial fan-sites dedicated to everything Warhammer 40k. The following is a list of both official and unofficial resources, blogspots, and fan sites dedicated to the Warhammer 40k universe:
- Games Workshop - Official website of Games Workshop, the developer and publisher of both Warhammer Fantasy and Warhammer 40,000 tabletop wargames, novels, short stories and video games.
- Forge World - A subsidiary company of Games Workshop that is dedicated to creating high-quality, exotic miniatures for passionate gamers as well as high-quality background rulebooks set in the Warhammer Fantasy Battle and Warhammer 40,000 fictional universes.
- The Black Library - The Black Library is a division of Games Workshop which is devoted to publishing novels and audiobooks set in the Warhammer Fantasy Battle and Warhammer 40,000 fictional universes.
- Specialist Arms - The website of of Games Workshop's Specialist Games range. This site exists as a rallying point for players and the communities of each of the seven Specialist Games, as well as games which may now be considered Specialist.
Warhammer 40k Forums
- Bolter and Chainsword - A great forum for almost all things Warhammer 40k.
- Dakka Dakka - A very popular forum that contains all things Warhammer 40k.
- Warseer - Another well known Warhammer 40k forum.
Horus Heresy Forums
- Heresy Online - An excellent Horus Heresy universe forum that primarily focuses on everything related to the galactic civil war known as the Horus Heresy.
- The First Expedition - Another excellent Horus Heresy universe forum that deals strictly with everything Horus Heresy related, hosted by Black Library's very own publisher Laurie Goulding.
Warhammer 40k Blogs
- Apocalypse 40K - Unofficial Warhammer 40,000 blogspot which contains news, rumours and resources for Warhammer 40K player.
- Bell of Lost Souls - Warhammer 40,000 and Warhammer Fantasy news, rumours and resources.
- Faeit 212: Warhammer 40k - Another well known unofficial Warhammer 40k blogspot that brings you daily news and rumours.
- Best War Game - A blog that focuses on Warhammer 40k battle experiences and tactics.
- Grey Knights Blogspotl - A Grey Knights veteran player shares his experiences in this Warhammer 40k blog.
- Ordo Malleus - A website dedicated to the Dark Heresy Roleplaying Game.
- How To Win at Warhammer 40k - An excellent blogspot that contains excellent resources for competitive Warhammer 40k players.
- Creative Twilight - A blog with lots of hobby articles (modeling, sculpting, converting and painting), as well as editorials about Warhammer 40K.
Warhammer 40k Resource Websites
- Red Elf - A massive website that contains a plethora of older Warhammer 40k material and resources.
- Realm of Chaos 80's - A nostalgic look back at the earliest iteration of the Realms of Chaos books that were first printed in the mid-1980's as well as containing other older resources such as copies of The Citadel Journals modelling magazine.
Warhammer 40k Wikis
- The Lexicanum - The largest and oldest Warhammer 40k Wiki project on the Web. It covers more topics, but in far less detail than the Warhammer 40,000 Wiki.
- Wargame Tactics - A wiki site with detailed tactics for Warhammer 40k and Fantasy
International Warhammer 40k Wikis
- Warhammer40.net - An online Warhammer 40k Wiki project brought to you in Spanish.
- La Colmena - Spanish community of Warhammer 40,000
- La Posada del Friki - Spanish community of Warhammer 40,000
- Association FEQ 40K France - The French association that manages tournaments for Warhammer 40K ETC team qualification
Tau Community Sites
- Kovash Tauva - An online Tau community
- Tau Online - Another Warhammer 40K online community that deals primarily with the Tau Empire.
Warhammer 40k Miniatures
- Eldritch Epistles - The ruminations and revelations of a Citadel Miniatures collector which includes multiple galleries of exquisitely painted miniatures by such well known artists as Bryan Ansell and John Blanche .
- Maximini - A well-known manufacturer of fine gaming miniatures that provides an unofficial alternative outlet for Warhammer 40k enthusiasts.
- Pocket Warhammer 40k - Resource website intended to allow the adaption of the Warhammer 40k ruleset to 6mm Epic miniatures.
- Warhammer Bargains - An excellent website to find all the Warhammer you'll ever need!
- Waylandgames - Discount Warhammer miniatures and other discount wargames.
Warhammer 40k Armies
Warhammer 40k Artists
- Gothic Punk - A blog collecting and celebrating the famous artist John Blanche, a British fantasy and science fiction illustrator and modeler whose style has greatly influenced the Warhammer 40K universe. This blog's attempted aim -- to create a comprehensive online collection of this prolific artist's work.
- Adrian Smith - Illustrator - Official blog displaying the artwork of famous fantasy illustrator Adrian Smith.
- The Art of Jon Sullivan (Archived) - Official website displaying both fantasy and sci-fi illustrations, many of which has graced both Games Workshop novels and magazines.
- The Art of Jon Sullivan (Updated) - Updated website of talented artist Jon Sullivan.
- Jon Sullivan Cover Artwork (Blog) - Blog by talented artist Jon Sullivan.
- Chris Trevas - Official website displaying the portfolio of artist Chris Trevas and his work.
- Mark Molnar - Official website displaying the fantasy artwork of famous illustrator Mark Molnar.