Ain't Misbehavin' is a musical revue with a book by Murray Horwitz and Richard Maltby Jr., and music by various composers and lyricists as arranged and orchestrated by Luther Henderson. It is named after the song by Fats Waller (with Harry Brooks and Andy Razaf), "Ain't Misbehavin'".

The musical is a tribute to the music of Fats Waller. It was a time when Manhattan nightclubs such as 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.