A Perfect Circle, often referred to as APC, is an alternative rock supergroup formed by guitarist Billy Howerdel and Tool front-man Maynard James Keenan. The band's latest line-up featured Jeordie White of Marilyn Manson and formerly of Nine Inch Nails tour line-up, on bass, James Iha, formerly of The Smashing Pumpkins on guitar, and prolific session drummer Josh Freese, who is also known from Nine Inch Nails tour line-up.

Although the group never officially disbanded, A Perfect Circle has been on hiatus since 2006, having not written new material, toured or recorded; but the band's personnel have kept busy with other projects.