Beasley Coliseum, Multi-purpose arena at Washington State University, Pullman, US.

Beasley Coliseum is a multi-purpose arena on the campus of Washington State University in Pullman, Washington, with seating for around 11,700 people. It is built to host basketball games, concerts, and large university events, with several entrances and a wide interior floor that can be reconfigured depending on the occasion.

The project was approved by the WSU board of regents in early 1969, and the building opened on June 3, 1973, with the university's commencement exercises. For its first eight years it was called the Washington State University Performing Arts Coliseum. In 1981 it was renamed for Wallis Beasley (1915–2008), a long-time sociology professor and executive vice president who had been WSU's faculty representative for athletics in the 1960s and also served as interim university president.

The arena is home to the Washington State Cougars basketball team, and game nights draw loud crowds dressed in the school colors of crimson and gray. Graduation ceremonies and concerts also take place here, making it a central part of student life on campus.

The arena sits at the heart of the Washington State University campus and is easy to reach on foot from most parts of it. Parking is available nearby, but checking conditions ahead of time is a good idea since availability can vary depending on the event.

In the fall of 1975, the arena was temporarily converted into a dormitory to house an unexpected overflow of incoming students. This improvised use earned it a nickname that still circulates among students and alumni today.