Gaspare "Gap" Mangione (born July 31, 1938) is a jazz pianist, composer, arranger, and bandleader from Rochester, New York, United States.

Born and raised in Rochester, Mangione's younger brother is Grammy-winning flugelhornist Chuck Mangione. Members of a music-loving family, both Gap and Chuck took up instruments. In 1958, they started performing together as the Jazz Brothers, eventually recording three albums for Riverside Records.

In 1968, Gap Mangione released his first solo album, Diana in the Autumn Wind, featuring drummer Steve Gadd and bassist Tony Levin in their first recordings, and new compositions and arrangements by Chuck Mangione who conducted as well. More solo albums followed, along with tours with his own group and many as featured pianist in his brother's orchestral performances throughout the 1970s.