Crosby High School is a public high school located in the East End section of the city of Waterbury, Connecticut. It is part of the Waterbury Public Schools district. It was first opened in 1851 and is currently the third oldest high school in Connecticut. It has an enrollment of approximately 1368 students. Originally located at 255 East Main Street in Waterbury, it moved to 300 Pierpont Road in September, 1974. It is attached to Wallace Middle School.