Once
- Blwyddyn: 2007
- Gwlad: Ireland, United States of America
- Genre: Drama, Music, Romance
- Stiwdio: Samson Films, Summit Entertainment, RTÉ, Fís Éireann/Screen Ireland
- Allweddair: rock 'n' roll, lovesickness, love of one's life, composer, pop, music instrument, lovers, dublin, ireland, recording studio, pianist, ireland, music store, street musician, songwriting, recording session, street singer, busking
- Cyfarwyddwr: John Carney
- Cast: Glen Hansard, Markéta Irglová, Hugh Walsh, Gerard Hendrick, Alaistair Foley, Geoff Minogue