"Adia" is a song by Canadian singer Sarah McLachlan from her fourth studio album, Surfacing (1997). It was co-written by McLachlan and her longtime producer, Pierre Marchand. McLachlan has said about the song, "...more than anything, it's about my problems in dealing with feeling responsible for everyone else". "Adia" was released as the third North American single from Surfacing on 2 March 1998; in Europe, it served as McLachlan's debut single, receiving a UK release in September 1998.