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The Complete Call of Cthulhu Experiencein a Special 50th Anniversary Collectable Slipcase Set The Call of Cthulhu Keeper Rulebook, Investigator Handbook, and Keeper Screen Pack are brought together in a premium collector’s slipcase, with all new cover art by acclaimed Swedish artist … read more

Today, on Halloween, The Chaosium officially turns 50 years old. On October 31, 1975 our founder Greg Stafford went down to the Alameda County Clerk’s office and filed the paperwork to officially register the company. Greg named us The Chaosium as a tribute to its birth as a “house of C … read more

From our talented friends at Type40: Extremely limited editionOnly 50 made, numbered from 1 to 50 on the inside. 50th AnniversaryDesigned specifically to carry and protect your Chaosium rule books. Beautiful and hard wearingHigh quality, handmade. These will last for decades and age beautifully. A … read more

Now available at Chaosium's Redbubble store: our Official 50th Anniversary Logo t-shirt! Available in a variety of styles and sizes from S to 5XL.#weareallus … read more

    Applications for the Chaosium 50th Anniversary Convention Support Pack are now closed.    Thank you to the several hundred TTRPG conventions around the world that applied. We'll be in touch with next steps soon! … read more

Hey, you may have heard we're turning 50 this year - here's the special commemorative pin we've had created for our anniversary! If you'd like one, catch Chaosium at one of the headline conventions we're attending this year: starting with Gary Con (March 20-23)! All attendees com … read more

2025 is Chaosium's 50th anniversary: our revered founder Greg Stafford established the company in 1975.  Stay tuned for some exciting announcements about how we'll be celebrating our half-century throughout the year, and ways you can join us in the celebrations! … read more