"Summer Night City" is a song recorded by the Swedish pop group ABBA, written by Benny Andersson and Björn Ulvaeus as a tribute to their hometown of . It is the group's second non-album single, released on 6 September 1978. It was originally intended as the lead single from the group's upcoming Voulez-Vous album, but was eventually not included. However, it was featured as a bonus track on the 1997 CD re-issue.

The recording sessions for "Summer Night City" began in early 1978. It had the working titles of "Kalle Sändare" and "Dancing in the Moonlight". ABBA's new recording studio, Polar Music Studio, had opened in May 1978, but had not been ready to use initially, so the primary backing track had been recorded at Metronome Studio. A 43-second ballad-style introduction to the song had been edited out to improve the overall quality, but nothing seemed to work. Allegedly, mixing the single took at least a week, far more than it took to mix any other track in ABBA's recording history. They felt something was wrong with the recording but couldn't put their finger on it. In the end, the song had an enormous amount of compression applied to it to give it a more "driving" sound. Agnetha has been quoted as saying she didn't like the song to start with, as she felt "it wasn't ABBA" but later on grew to like it. A reluctant ABBA decided to release "Summer Night City" as a single in September despite their disappointment with the track in its current form. The group still performed the song live on their 1979 world tour, though with the original introduction that had been removed from the studio recording. The previously unreleased version with the extended introduction was finally released as part of the box set Thank You for the Music in 1994.

Their ambivalence about the record has surfaced occasionally in interviews where Benny has said "we shouldn't have released that one", and Bjorn called the recording "really lousy".

The single's B-side was a medley of the American traditional songs "Pick a Bale of Cotton", "On Top of Old Smokey", and "Midnight Special", which the group had recorded in 1975. This was the only song released by ABBA that was not written by any of the members themselves. On the single, "Medley" was actually a compressed version of the original 1975 version that had been issued on the German charity album Stars im Zeichen eines guten Sterns (Polydor). However, the 1978 compressed version is very similar, so much so that a mistake was made in the booklet notes of the 1994 4-CD boxed set Thank You for the Music. It turned out that the 1975 original version was included in that set but it was claimed to be the 1978 compressed. The "Medley" mystery was allegedly solved when the UK single master tapes were returned by Epic Records to Polar Music in Sweden in the early 2000s. As the UK tapes had definitely included the 1978 compressed version, it then became possible to determine which version was which. An uneducated explanation of this by ABBA reporter Carl Magnus Palm appeared on his website.

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