William John Paul "Liam" Gallagher (born September 21, 1972 in Burnage, Manchester) is an English singer for the band Oasis. His erratic behaviour, distinctive singing style and abrasive attitude have been the subject of commentary in the press. Although his brother Noel Gallagher writes the majority of the band's songs, in recent years Liam has increasingly developed himself as a songwriter, and has contributed songs for the group's most recent albums.

Liam Gallagher was one of the figureheads of the Britpop movement in the 1990s and remains one of the most recognisable characters in modern British music. A 2007 poll rated him among the ten greatest wits ever.