Chaosium is a tabletop game publisher known for its role-playing games, particularly Call of Cthulhu, which is based on the works of author H.P. Lovecraft. Founded in 1975, the company has developed a variety of games that emphasize storytelling and immersive experiences. In addition to Call of Cthulhu, Chaosium produces games like RuneQuest and Pendragon. The company is recognized for its contributions to the gaming community, including the development of game systems that encourage creativity and collaboration among players.