Circle X is a not-for-profit ensemble theatre company located in Hollywood, California.

Circle X's productions have been described by critics as "refreshingly original and imaginative" and "consistently stellar".

Circle X was founded in 1996 by seven artists and to date has produced 27 plays in the Los Angeles area.

Circle X is part of the Los Angeles 99-Seat Equity Waiver theatre community, a group of theatres that may employ members of the Actors' Equity Association without paying them union wages.

Similar theatres include Sacred Fools Theater Company and The Actors' Gang.