Jazz on a Summer's Day is a concert film set at the 1958 Newport Jazz Festival in Rhode Island, directed by commercial and fashion photographer Bert Stern and Aram Avakian, who also edited the film. Running time: 1 hour 18 minutes.

The film features performances by Jimmy Giuffre, Thelonious Monk, Sonny Stitt, Anita O'Day, Dinah Washington, Gerry Mulligan, Chuck Berry, Chico Hamilton with Eric Dolphy, and Louis Armstrong with Jack Teagarden. Also appearing are Buck Clayton, Jo Jones, Armando Peraza, and Eli's Chosen Six, the Yale College student ensemble that included trombonist Roswell Rudd, shown driving around Newport in a convertible jalopy, playing Dixieland. As was scheduled in advance and announced in the program, the last performer on Saturday night was Mahalia Jackson, who sang a one-hour program beginning at midnight, thus ushering in Sunday morning. The film concluded with her performance of The Lord's Prayer.

The relaxed laid back atmosphere of the1958 Newport Jazz Festival and the pantheon of stars who performed there has led to its being described as the Woodstock of the Jazz world, a decade before the legendary four-day Rock event at Bethel, New York.