Haymarket Riot is a Chicago-based post-punk/rock band that was formed in 1999 by Mike Bennett, Kevin J. Frank, Fred Popolo and Billy Smith. The current line-up consists of Kevin J. Frank, Fred Popolo and Brian Wnukowski. The band's notable albums are Bloodshot Eyes, released in 2001, and Mog, released in 2004. Since 1999, Haymarket Riot has toured North America, Europe and Japan.

On April 7, 2009, Haymarket Riot released its third full-length album titled Endless Bummer on CD and as a digital download. The LP edition was later released on September 29, 2009, with alternate artwork and a download card which contains 2 bonus tracks. Early sessions for Endless Bummer were recorded with Steve Albini at Electrical Audio in Chicago, IL March 8–9, 2008. Overdubs were done from April 7, 2008 - May 27, 2008, at Studio Greg Studios II in Chicago, IL by Greg Norman. Mixing was done November 22–23, 2008, and December 15, 2008, by Greg Norman at Electrical Audio. Mastering was done January 28 - February 8, 2009, by Carl Saff at Saff Mastering in Chicago, IL. The CD version was a limited pressing with hand silk screened covers.

Haymarket Riot features or has featured ex-members of Gauge, Traluma, Radio Flyer, Big'N, Sweep The Leg Johnny, Six Of One Half Summers, Just A Fire, Neutrino, Orwell, Hubcap, The Sky Corvair, Dempsey, and the Traitors. Brian Wnukowski also is the current drummer for Cougars. Kevin J. Frank is also the current drummer for Milwaukee's Chariots Race.