We're excited that our award-winning Age of Vikings RPG is going to be one of featured roleplaying game systems in this January's New Gamemaster Month, run by our friends at Monte Cook Games.  Chaosi

Chaosium Con Ann Arbor 2026 event registration is now open!. If you've got your badge, you can start signing up for events! Yes, that includes those highly coveted VIP Events! And there are badges av

It's week three of New Gamemaster Month, and if you’re just jumping in, don’t fret—it’s not too late. You have a bit of catching up to do, but nothing you can’t handle. This is the annual month-long s

We've added a Print-On-Demand (POD) option to five more Call of Cthulhu Classic titles at DriveThruRPG:Secrets of Tibet (168 page softcover) - this sourcebook features details about its history, cultu

Chaosium is excited that a classic Call of Cthulhu scenario — Keith Herber's The Fungi From Yuggoth — has been adapted into a 1930s style radio drama by Dark Adventure Radio Theatre! No doubt the late

Submit your questions for a coming AMA: Encyclopedia Cthuliana, the definitive guide to the Cthulhu Mythos. Our host Bridgett Jeffries will be talking with Encyclopedia Cthulhiana author Dan Harms.  

At Gen Con on Thursday August 4th Chaosium's Brian Holland is a guest of The Glass Cannon Network. Brian will be demoing our brand new actual play demo games for Call of Cthulhu, RuneQuest, and 7th Se

To all members of the tribe, our heartfelt thanks for your support in this year, and for joining us in our 50th anniversary celebrations. We wish you the compliments of the season, and all the best f

UNVEIL THE SECRETS OF THE LEGEND-HAUNTED CITYCall of Cthulhu: Arkham is the definitive guide to the signature setting of Call of Cthulhu.On the streets of Arkham, the threat of the Cthulhu Mythos is e

It's week three of New Gamemaster Month, and if you’re just jumping in, don’t fret—it’s not too late. You have a bit of catching up to do, but nothing you can’t handle. This is the annual month-long s

Have you thought about GMing—maybe always wanted to give it a shot—but haven’t quite taken the plunge? What if we told you that by the first week in February, you could be an honest-to-goodness GM—and

The Call of Cthulhu release Malleus Monstrorum is now available on Roll20!Here, shall you know the terrors of the void, the nightmare bringers, and the unspeakable lurkers...Ancient secrets, whispered