Crystal Ballroom, originally built as Cotillion Hall, is a historic building on Burnside Street in Portland, Oregon, United States.

Starting in the 1960s, the hall has also been host to many popular pop, rock, folk, blues and jazz artists, as well as beat poetry and other entertainment.

In the early 1960s, due to flagging revenues, new acts were brought in, such as gypsy brass bands and R&B performers, such as James Brown, Marvin Gaye, and Ike & Tina Turner.

The main ballroom features a mechanical "floating" dance floor, thought at the time of its building to be the only one on the West Coast, and is potentially the only one still in existence in the United States.

[5] In 2000 or 2001 a large 20'x20' square opening was cut into the center/middle edge of the main ballroom floor to make additional fire exits in order to sell more tickets for live music events.

An urban legend in the Portland area purports that on April 5, 1965, Little Richard fired guitarist Jimi Hendrix onstage during a concert at the ballroom, allegedly for lack of skill.