Atlantic Theater Company is an Off-Broadway non-profit theater. The company was founded in 1985 by David Mamet, William H. Macy, and 30 of their acting students from New York University, inspired by the historical examples of the Group Theatre and Stanislavski.

An off-Broadway theatre is any professional theatre venue in New York City with a seating capacity between 100 and 499, inclusive. These theatres are smaller than Broadway theatres, but larger than off-off-Broadway theatres, which seat fewer than 100.