Rooney Mara
Young Roseanne McNulty

Theo James
Father Gaunt

Vanessa Redgrave
Old Roseanne McNulty

Eric Bana
Dr. William Grene

Jack Reynor
Michael Eneas

Aidan Turner
Jack McNulty

Susan Lynch
Nurse

Tom Vaughan-Lawlor
McCabe

Charlie Kelly
Beau

Nika McGuigan
Chrissie

Antony Acheampong
G.I Grove

Pauline McLynn
Anne McCartney

Brian Fortune
Psychiatric Analyst

Elva Trill
Pregnant Woman

Laurence O'Fuarain
Detective

John Connors
Joe Brady

Lesa Thurman
Nurse O'Donnell

Enda Oates
Driver

Sheila Moylette
Angela

Ryan McAllister
Paddy

Geraldine McAlinden
Sister Mary

Mark Quigley
Doctor

Derek Carroll
Villager (uncredited)