Platypus Affiliated Society

The Platypus Affiliated Society (alternatively Platypus or PAS) is an international educational organization focused on left-wing and Marxist history and thought. It was founded by Chris Cutrone and his students at the School of the Art Institute of Chicago in 2006.

Platypus organizes reading groups, forums, and research and journalism, focused on the inherited problems of what it terms the Old, New, and post-political left. It describes itself as "hosting the conversation on the left" in order to "dissolve ideological obstacles to the reestablishment of socialism." As of 2025 it reports around 50 chapters, principally in North America, Europe, and Oceania and usually based on university campuses.