"Saturday Night" is a 1976 pop hit by the Scottish band Bay City Rollers. It was written and produced by Bill Martin and Phil Coulter. The tune is an upbeat pop-rock number with a memorable hook: the word "Saturday" spelled out in a rhythmic chant.

An early version of the song was recorded in the UK in 1973, but did not hit the charts. On the first version Gordon "Nobby" Clark was the lead singer of the band. The song was re-recorded for the Rollers' 1974 UK album Rollin', but never saw release as a single in their home country; by this time Clark had left the band for solo work and had been replaced by Les McKeown. The re-recording was issued as a US single in late 1975 and became a smash hit in early 1976, becoming the first Billboard #1 of the US Bicentennial year. Despite a string of worldwide hit songs, and other US hits, "Saturday Night" was the group's only enduring American hit.

Among the remakes of "Saturday Night" is a 1993 hit version by Ned's Atomic Dustbin, featured in the Mike Myers movie So I Married an Axe Murdereralong with the Bay City Rollers' original.

Japanese comedian Gorie released a cover of "Saturday Night" called "Pecori Night" which was the 48th best-selling single in Japan for 2005, according to Oricon charts. Although the melody is the same, the lyrics are completely different from the original.

Also, the Japanese producer Yoichiro Ito - Akakage released a groove disco cover.

Japanese boyband Arashi borrows the chorus replacing the lyrics Saturday Night with Carnival Night, in their song Carnival Night Pt. 2

Japanese band JAM Project uses the Saturday Night chant rhythm in its song "March of Rescue Hero."

Japanese band Tokio uses elements from Saturday Night in their song "Kanpai!!"

A local band from Ottawa, Ontario, Canada, Harpoon (formerly known as the Eric Eggleston Band) did a cover of the song in 2008. It is commonly used during Saturday night Ottawa Senators games at Scotiabank Place.

Drake Bell also did a live cover of this song at his concert at the Auditorio Nacional in his dvd "Drake Bell In Concert."