John Carney Director, Screenwriter, Producer, Original Music Ferdia Walsh-Peelo Cosmo Actor Lucy Boynton Raphina Actor Jack Reynor Brendan Actor Aidan Gillen Robert Actor Maria Doyle Kennedy Penny Actor Mark McKenna Eamon Actor Kelly Thornton Ann Actor Ian Kenny Barry Actor Ben Carolan Darren Actor Percy Chamburuka Ngig Actor Karl Rice Garry Actor Conor Hamilton Larry Actor Don Wycherley Brother Baxter Actor Lydia McGuinness Mrs. Dunne Actor Kyle Bradley Donaldson Fifth Former Actor Anthony Bregman Producer Martina Niland Producer Kevin Scott Frakes Executive Producer Raj Brinder Singh Executive Producer Bob Weinstein Executive Producer Harvey Weinstein Executive Producer Yaron Orbach Cinematographer Andrew Marcus Film Editing Julian Ulrichs Film Editing Gary Clark Original Music Alan MacDonald Production Design Tamara Conboy Set Decoration Tiziana Corvisieri Costume Design Louise Kiely Casting