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.

Broadway theatre, or Broadway, is a theatre genre that consists of the theatrical performances presented in 41 professional theaters, each with 500 or more seats, in the Theater District and Lincoln Center along Broadway, in Midtown Manhattan, New York City. Broadway and London's West End together represent the highest commercial level of live theater in the English-speaking world.