John Birks "Dizzy" Gillespie (pronounced /ɡɨˈlɛspi/; October 21, 1917 – January 6, 1993) was an American jazz trumpet player, bandleader, singer, and composer dubbed "the sound of surprise".

Together with Charlie Parker, he was a major figure in the development of bebop and modern jazz. He taught and influenced many other musicians, including trumpeters Miles Davis, Fats Navarro, Clifford Brown, Arturo Sandoval, Lee Morgan, Jon Faddis and Chuck Mangione.
Allmusic's Scott Yanow wrote that "Dizzy Gillespie's contributions to jazz were huge. One of the greatest jazz trumpeters of all time (some would say the best), Gillespie was such a complex player that his contemporaries ended up copying Miles Davis and Fats Navarro instead, and it was not until Jon Faddis's emergence in the 1970s that Dizzy's style was successfully recreated . . . Arguably Gillespie is remembered, by both critics and fans alike, as one of the greatest jazz trumpeters of all time.
In addition to featuring in the epochal moments in bebop, he was instrumental in founding Afro-Cuban jazz, the modern jazz version of what early-jazz pioneer Jelly Roll Morton referred to as the "Spanish Tinge". Gillespie was a trumpet virtuoso and gifted improviser, building on the virtuoso style of Roy Eldridge but adding layers of harmonic complexity previously unknown in jazz. Dizzy's beret and horn-rimmed spectacles, his scat singing, his bent horn, pouched cheeks and his light-hearted personality were essential in popularizing bebop.