"Adia" is a song by Canadian singer Sarah McLachlan that originally appeared on her 1997 album Surfacing. It was co-written by McLachlan and her longtime producer, Pierre Marchand. On VH1 Storytellers, McLachlan also said about the song, "I'm not quite sure how to explain this one but, uh, I guess more than anything it's about my problems in dealing with feeling responsible for everyone else".