"Begin the Beguine" is a song written by Cole Porter (1891–1964). Porter composed the song at the piano in the bar of the Ritz Hotel in Paris. In October 1935, it was introduced by June Knight in the Broadway musical Jubilee produced at the Imperial Theatre in New York City.

Based on the title dance, the song is notable for its 108-measure length, departing drastically from the conventional thirty-two-bar form.