Liam O'Neil (born September 18, 1980) is a Canadian musician and music producer, best known as the keyboardist and percussionist for Montreal-based band the Stills.

[1] He later spent 18 months away from Montreal while he played in a jazz trio on a cruise ship, but he stayed in contact with the members of the Stills.

After initially touring with the band, he became a full-time member when his bandmates heard him play a half-hour piano solo in a hotel bar.

A talented multi-instrumentalist, he played piano, organ, saxophone and tambourine on the record, as well as providing backing vocals on a number of tracks.

O'Neil contributed synth, piano, organ, and baritone and tenor sax to various tracks on Kings of Leon's 2010 album Come Around Sundown.