Yö (en. "Night") is a Finnish rock band, formed in 1981 at Pori, Finland.
The band has had many line-up changes during their history, and almost 20 different musicians play or have played with the band. Yö's first line-up included singer Olli Lindholm and composer, singer and keyboardist Jussi Hakulinen, guitarist Jani Viitanen, bassist Juha Rauäng and drummer Harri Varhala. Olli Lindholm is the only remaining original member of the band, with current line-up consisting of keyboardists Mikko Kangasjärvi and Jari Latomaa, guitarist Daffy Terävä, bassist Jukka Lewis and drummer Ari Toikka. Although usually thought of as a band from Pori, nowadays they're more or less based in Tampere.
Yö's most famous songs include "Joutsenlaulu" (Swan Song), "Likaiset legendat" (Dirty Legends), "Ihmisen poika" (Human's Son), "Rakkaus on lumivalkoinen" (Love is Snow White), "Särkynyt enkeli" (Shattered Angel) and "Tia-Maria".