UCB Theatre, or the Upright Citizens Brigade Theatre, is a renowned comedy venue founded in 1990 by Amy Poehler, Matt Besser, Ian Roberts, and Matt Walsh. Located in New York City and Los Angeles, it focuses on improvisational and sketch comedy, offering performances and classes to aspiring comedians and actors. The theatre is known for its unique approach to comedy, emphasizing the importance of collaboration and creativity. It has produced many successful comedians and shows, contributing significantly to the comedy landscape in the United States. UCB Theatre continues to be a hub for innovative comedic talent and entertainment.