Circus of Books was a bookstore and gay pornography shop owned by Karen and Barry Mason, with locations in West Hollywood and Silver lake. As a notable Los Angeles gay cruising spot, place of refuge during the AIDS crisis, and mom-and-pop porn shop fighting federal obscenity charges, both locations are now considered important sites of Los Angeles' gay history.

A documentary on the store, filmed by the Masons' daughter Rachel Mason, was released in 2019.