La MaMa Experimental Theatre Club is an Off-Off-Broadway theater founded in 1961 by African-American theatre director, producer, and fashion designer Ellen Stewart. Located in the East Village neighborhood of Manhattan in New York City, the theater began in the basement boutique where Stewart sold her fashion designs. Stewart turned the space into a theater at night, focusing on the work of young playwrights.

Off-off-Broadway theaters are smaller New York City theaters than Broadway and off-Broadway theaters, and usually have fewer than 100 seats. The off-off-Broadway movement began in 1958 as part of a response to perceived commercialism of the professional theatre scene and as an experimental or avant-garde movement of drama and theatre. Over time, some off-off-Broadway productions have moved away from the movement's early experimental spirit.