"So Long" is a song by Swedish pop group ABBA, released as the first single from their album ABBA.

"So Long" was written and composed by Björn Ulvaeus and Benny Andersson, with lead vocals by Agnetha Fältskog and Anni-Frid Lyngstad.

The song is musically similar to "Waterloo".

[citation needed] Backed with "I've Been Waiting for You," another song from the ABBA album, the single was a hit in some European countries, although failed to chart in the UK, despite TV promotion[2] and relatively favourable reviews in the music press.

This 1970s single–related article is a stub.