Tomm Moore Director, Producer Brendan Gleeson Conor Voice Fionnula Flanagan Grandmother, Macha Voice David Rawle Ben Voice Pat Shortt Voice Jon Kenny Voice Lisa Hannigan Voice Lucy O'Connell Saoirse Actor Colm Ó'Snodaigh Mossy Voice Will Collins Screenwriter Ross Murray Producer Paul Young Producer Stéphan Roelants Producer Serge Ume Producer Isabelle Truc Producer Clément Calvet Producer Jérémie Fajner Producer Frederik Villumsen Producer Claus Toksvig Kjaer Producer Darragh Byrne Film Editing Bruno Coulais Original Music Kila Original Music Adrien Merigeau Production Design, Art Director