Delta Green

Delta Green is a role-playing game from Arc Dream Publishing about a secretive organization tasked with protecting the United States from paranormal and alien threats. The setting combines the 1920s Cthulhu Mythos of H.P. Lovecraft with modern conspiracy fiction. It originated in 1992 as a setting for the Call of Cthulhu role-playing game, created by Adam Scott Glancy, Dennis Detwiller, and John Scott Tynes, a.k.a. the Delta Green Partnership, of the Seattle gaming house Pagan Publishing.

In 2016 the Agent's Handbook was released, followed by the Handler's Guide in 2018, giving the game its first standalone rule books. In 2018 Arc Dream also partnered with Pelgrane Press on a prequel game set in the 1960s. It is named The Fall of DELTA GREEN and uses the Gumshoe System.