Circulus are a psychedelic folk/progressive rock band from South London, England, founded by vocalist Michael Tyack.

The band uses a mix of modern and medieval instruments, such as the lute, cittern, crumhorn and rauschpfeife, along with the moog synthesizer, bass and electric guitars. Tyack claims to believe in fairies and pixies, and they have been known to play their live shows with the audience sitting on the floor.