Collaborative Arts Project 21, known more commonly as CAP21, is a New York City professional musical theatre training conservatory and Off-Broadway theatre company. It has a large faculty and student body. The conservatory has produced many Broadway performers, as well as actors in off-Broadway, regional, and international theatre, television, film, and other performance media. Until 2012, it was in partnership with the New York University's Tisch School of the Arts. In 2014, CAP21 joined forces with Molloy College.
As a producing organization, CAP21 began in 1994. Its productions take place at CAP21 or at venues in New York City and around the United States. Each season, three new works are produced for a two-week "work in progress" run. In addition CAP21 works in development with twenty new musicals and plays providing public and in-house readings. CAP21's season features diverse productions of new and classic plays and musicals, drawing audiences from the greater New York metropolitan area. Nearly 200 theatre artists are engaged each year to create and present new and classic work.
In 2012 the CAP21 Theatre Company won a GLAAD award for Outstanding New York Theatre: Off and Off-Off Broadway, for its production of the new musical Southern Comfort. The production starred Jeffrey Kuhn and Natalie Joy Johnson.