The William O'Neill Athletic and Convocation Center (O'Neill Center) is an 80,000-square-foot (7,400 m2) multi-purpose athletic complex, at Western Connecticut State University, in Danbury, Connecticut.

The 4,500-seat arena can also be used for concerts, shows, and other public events.

Bob Dylan kicked off his Paradise Lost Tour at the arena on December 7, 1995.

The arena hosted the final rounds of the NCAA Division III women's basketball tournament in 1999, 2000, and 2001.

The O'Neill Center is home to the athletics offices, a weight room, a swimming pool, and the Feldman Arena where games are played.