"December, 1963 (Oh, What a Night)" is a song originally performed by the Four Seasons, written by original Four Seasons keyboard player Bob Gaudio and his future wife Judy Parker, produced by Gaudio, and included on the group's album, Who Loves You (1975).

The song features drummer Gerry Polci on lead vocals, with Frankie Valli, the group's usual lead vocalist, singing the bridge sections and backing vocals and bass player Don Ciccone singing the falsetto part.