Ain't Misbehavin' is a musical revue with a book by Murray Horwitz and Richard Maltby, Jr., music by Thomas Wright "Fats" Waller, and lyrics by various writers. It is named after the song by Fats Waller, "Ain't Misbehavin'"

It serves as a tribute to the black musicians of the 1920s and '30s who were part of the Harlem Renaissance, an era of growing creativity, cultural awareness, and ethnic pride, and takes its title from the 1929 Waller song "Ain't Misbehavin'". It was a time when Manhattan nightclubs like the Cotton Club and the Savoy Ballroom were the playgrounds of high society and Lenox Avenue dives were filled with piano players banging out the new beat known as swing. Five performers present an evening of rowdy, raunchy, and humorous songs that encapsulate the various moods of the era and reflect Waller's view of life as a journey meant for pleasure and play.