"Ain't Misbehavin'" is a song by Harry Brooks with Fats Waller and lyricist Andy Razaf, dating from 1929. The singer is not cheating on a lover: "Ain't misbehavin', I'm savin' my love for you". Fats Waller recorded the definitive version, which he also performed in the 1943 film Stormy Weather. It has been recorded by countless other performers over the years, including Bill Haley & His Comets who recorded a rock and roll version in 1957.
This title was later used for a Broadway show (see below).
In 2004, it was one of 50 recordings chosen that year by the Library of Congress to be added to the National Recording Registry.