The Mount Baker Theatre (officially abbreviated MBT) is a 1,517-seat performing arts venue and national historic landmark in Bellingham, Washington, United States.

[1][3] The theater's main stage is the largest theatrical venue in Washington north of Seattle's Paramount and 5th Avenue.

[4] The facility is owned by the city of Bellingham[5] and managed by the nonprofit Mount Baker Theatre organization, headed by president Gary Barnett and executive director Brad Burdick.

The theater has a professional lighting and sound system, a large movie screen and projection room, and a historic pipe organ.

[7] The Encore Room is a 1,200 square feet (111 m2) reception hall or meeting space in the southern portion of the theater.

[9] The Mount Baker Theatre hosts a variety events including live theater, concerts, movies, arts festivals, and comedy shows.

The original City Hall, built in 1891, stands two blocks west of the theater and is home to the Whatcom Museum.