"Summer Nights" is a popular song from the musical Grease. Written by Jim Jacobs and Warren Casey, its best-known version was recorded by John Travolta and Olivia Newton-John for the big-screen adaptation of the musical, and released as a single that same year.

"Summer Nights" became a massive hit in both the United States and United Kingdom during the summer of 1978. Included on the movie's soundtrack album, the song was one of several hit singles from the movie. Parts of the song were introduced to a new audience when it was re-released in the 1990s as part of a megamix of several songs from the movie version.

In the movie version of Grease, Travolta and Newton-John played the lead roles of Danny Zuko and Sandy Olsson.

The song's genesis stems from a summertime love affair between Danny and Sandy, which had ended upon Sandy's revelation that she was moving back to Australia with her family. However, Sandy soon learns that her family is staying in the United States and subsequently enrolls at Rydell High School, where Danny is also a student. However, it quickly becomes clear that there are unresolved feelings of love between Danny and Sandy.

Separately and unknown to each other, both Danny and Sandy meet with their respective group of friends and share their perspectives of their summertime fling. Danny, the leader of a greaser gang known as "The T-Birds" (the "Burger Palace Boys" in the stage show), brags about the physical aspects of the relationship; Sandy remarks to the schoolgirl clique "The Pink Ladies" about her emotional attachment to Danny. The resulting conversations are played out through the song.

Of the cast members, only Travolta and Newton-John provided vocals for the previous single from the soundtrack, "You're The One That I Want", but other members of the cast contributed backing and cameo lead vocals to "Summer Nights". 's solo line "'Cause he sounds like a drag" was spoken rather than sung.

"Summer Nights" reached No. 5 on the U.S. Billboard Hot 100, and spent two weeks at No. 3 on Cash Box Top 100. The song was an even bigger hit in the UK, spending seven weeks at No. 1. Combined with an earlier nine-week run with "You're the One That I Want," the Travolta-Newton-John duet team spent 16 weeks at No. 1 during 1978 in the UK.

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