"Birthday" is a song written and recorded by Icelandic band the Sugarcubes. It was released as a single in 1987, and included in their 1988 debut album Life's Too Good. It was their first international single and the first single released from the album. The Icelandic version, "Ammæli", was released on the Iceland-only single "Einn Mol'á Mann" the previous year, and it was included as the B-side on the international single and on the frontwoman Björk's box set Family Tree (2002).

The Sugarcubes was an Icelandic alternative rock band from Reykjavík formed in 1986 and disbanded in 1992. For most of their career, the band consisted of Björk Guðmundsdóttir, Einar Örn Benediktsson, Þór Eldon (guitar), Bragi Ólafsson (bass), Margrét "Magga" Örnólfsdóttir (keyboards) and Sigtryggur Baldursson (drums). Previous members included Friðrik Erlingsson (guitar) and Einar Melax (keyboards).