Happy Reunion is an album by American pianist, composer and bandleader Duke Ellington recorded in 1956 and 1958 but not released until 1985 on the Doctor Jazz label. The album features two small group sessions led by Ellington and recorded in Chicago.

The AllMusic review by Scott Yanow stated: "A particular highlight is hearing Gonsalves play 31 choruses on 'Diminuendo and Crescendo in Blue' in this setting."

All compositions by Duke Ellington except where noted