"December, 1963 (Oh, What a Night)" is a song 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 the usual lead Frankie Valli singing the bridge sections and backing vocals, and bass player Don Ciccone (former lead singer of The Critters) singing the falsetto part (And I felt a rush like a rolling ball of thunder / Spinning my head around and taking my body under).

According to the co-writer and longtime group member Bob Gaudio, the song was originally set in 1933 with the title "December 5th, 1933," and celebrated the repeal of Prohibition, but the lyrics were changed at the urgings of Frankie Valli and lyricist Parker to reposition the song as a nostalgic remembrance of a young man's first affair with a woman, and, more specifically, Gaudio's courtship with his wife, Judy Parker.

The song is an up-tempo, piano-led dance song with a distinct and easily recognizable opening drum and then piano riff. It is written in 4/4 and in the key of D-flat major.

The single was released in December 1975 and hit number one on the UK Singles Chart on February 21, 1976. It repeated the feat on the U.S. Billboard Hot 100 on March 13, 1976, remaining in the top spot for three weeks and one week on Cash Box. Billboard ranked it as the No. 4 song for 1976. On April 10 the same year, it topped the RPM National Top Singles Chart in Canada. Drummer Gerry Polci sang lead with bassist Don Ciccone and long-time frontman Frankie Valli singing the bridge and refrain. It was the Four Seasons' final song, as a group, to reach number one. (Valli would have one final chart-topper as a solo act in 1978 with the theme song to the film Grease.)

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