Publisher of Call of Cthulhu and many other fine games: Chaosium
Publisher of Trail of Cthulhu, The Fall of DELTA GREEN, and many other fine games: Pelgrane Press
Author who created the original Cthulhu Mythos: H. P. Lovecraft
Publisher run by the designer of the Call of Cthulhu game, Sandy Petersen: Petersen Games
Our inspiration, the original Call of Cthulhu fan magazine: The Unspeakable Oath
Current publisher of The Unspeakable Oath and Delta Green: Arc Dream
Cthulhu Mythos fan site, resource, wiki and more: yog-sothoth.com
Publisher of the Cthulhu magazine The Arkham Gazette: Sentinel Hill Press
Publisher of the great Cthulhu supplement Harlem Unbound: Darker Hue Studios
Publisher of Cthulhu Mythos supplements, adventures and more: Stygian Fox
Publisher of Cthulhu Invictus (the official Roman Empire-era Cthulhu setting and adventures) and other Cthulhu games: Golden Goblin Press
Publisher of Cthulhu scenarios: New Comet Games
Publisher of Cthulhu scenarios: Sons of the Singularity
Publisher of Apocthulhu, Convicts & Cthulhu, Dateline: Lovecraft and more: Cthulhu Reborn
Creator of Cthulhu props and radio dramas: The H. P. Lovecraft Historical Society
Cthulhu fan group that runs events at Origins Game Fair: Rogue Cthulhu
Cthulhu fan group in Spain: Leyenda.net
Cthulhu fan group in Germany: Deutsche Lovecraft Gesellschaft e.V.
Publisher of Cthulhu games in Castilian Spanish and French: Edge Entertainment
Publisher of Cthulhu games in Castilian Spanish: Shadowlands Ediciones
Publisher of Cthulhu games in German: Pegasus Spiele
Publisher of Cthulhu games in Italian: Raven
Publisher of Cthulhu games in Japanese: Kadokawa
Publisher of Cthulhu games in Polish: Black Monk
Publisher of Cthulhu games in Swedish: Eloso Förlag
Publisher of Cthulhu games in Ukrainian: Geekach