"October" is the seventh and title track from U2's 1981 album, October. It is a departure from U2's classic sound, as it is a quiet, almost instrumental piece. It was included as a hidden track on The Best of 1980-1990 compilation. It is the only track from October included in the compilation.

The lyrics reflect the Christian beliefs Bono, The Edge, and Larry Mullen as they were struggling as members of a devoutly religious group. They considered breaking up the band as they felt it may conflict with their faith.

"October" made its live debut on 16 August 1981 and this performance featured extended, rambling lyrics from Bono that were never used again live. It was a setlist staple for much of the October Tour and followed "I Fall Down", another song from the October album that The Edge played on piano. However, it was omitted from the setlist at all 1982 dates where U2 supported the J. Geils Band.

Two alternate versions of "October" were released on the 1982 soundtrack to They Call it an Accident. The first is a remix, clocking in at 2:31, which is quite similar to the album version, save for an instrumental outro tacked on at the end. The second mix is an instrumental one clocking in at 1:25; This is really just a shortened version of the album mix.