Irving Caesar (July 10, 1895 in New York – December 18, 1996 in New York), was a prominent American lyricist and theater composer who wrote lyrics for "Swanee," "Sometimes I'm Happy," "Crazy Rhythm," and "Tea for Two," one of the most frequently recorded tunes ever written.

Caesar, the son of Morris Keiser, a Romanian Jew, was born Isidor Keiser. His older brother Arthur Caesar was a successful Hollywood screenwriter. The Caesar brothers spent their childhood and teen years in Yorkville, the same Manhattan neighborhood where the Marx Brothers were raised. Caesar knew the Marx Brothers during his childhood.

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