Roy David Eldridge (January 30, 1911- February 6, 1989) was a jazz trumpet player in the Swing era. His sophisticated use of harmony, including the use of tritone substitutions, resulted in him sometimes being seen as a link between Louis Armstrong-era swing music and Dizzy Gillespie-era bebop.

Eldridge was born in Pittsburgh, Pennsylvania. His nickname was Little Jazz. Eldridge played in the bands of Fletcher Henderson, Gene Krupa and Artie Shaw before making records under his own name. He also played in Benny Goodman's and Count Basie's Orchestras, and co-led a band with Coleman Hawkins.