Cillian Murphy as Bill Furlong

Emily Watson as Sister Mary

Michelle Fairley as Mrs. Wilson

Eileen Walsh as Eileen Furlong

Zara Devlin as Sarah Redmond

Clare Dunne as Sister Carmel

Helen Behan as Mrs. Kehoe

Ella Cannon as Laundry Girl

Patrick Ryan as Pat

Peter Claffey as Barry

Ian O'Reilly as Pj

Sarah Morris as Sarah's Mother

Cillian O'Gairbhi as Sarah's Father

Tadhg Moloney as Diarmuid Sinnott

Liadán Dunlea as Kathleen Furlong

Giulia Doherty as Joan Furlong

Rachel Lynch as Sheila Furlong

Aoife Gaffney as Grace Furlong

Faye Brazil as Loretta Furlong

Agnes O'Casey as Sarah Furlong

Louis Kirwan as Young Bill Furlong

Mark McKenna as Younger Ned

Clare Dunne as Sr. Carmel

Joanne Crawford as Norma Sinnott

Aidan O'Hare as Mick Sinnott

Ryan Waters as Young Boy Drinking Milk

Maire Ni Ghrainne as Sr. Anne

Patricia Twomey as Sr. Frances

Abby Fitz as Lisa

Amy De Bhrún as Emma

Vega Farrelly as Little girl with Emma

Clare Monnelly as Niamh

Helen Gregg as Kate

Hugh McAllister as Barber

Ella Cannon as Laundry Girl (uncredited)

Tom Leavey as Pub Goer (uncredited)

John McCarthy as Father with Boy (uncredited)