Colin Farrell
David
Rachel Weisz
Short Sighted Woman
Olivia Colman
Hotel Manager
Léa Seydoux
Loner Leader
Michael Smiley
Loner Swimmer
Ariane Labed
The Maid
John C. Reilly
Lisping Man
Ben Whishaw
Limping Man
Angeliki Papoulia
Heartless Woman
Jessica Barden
Nosebleed Woman
Emma O'Shea
Nosebleed Woman's Best Friend
Ashley Jensen
Biscuit Woman
Roger Ashton-Griffiths
Doctor
Anthony Dougall
70 Year Old Waiter
Anthony Moriarty
30 Year Old Waiter
Sean Duggan
Guard Waiter
Imelda Nagle Ryan
Loner Leader's Mother
Roland Ferrandi
Loner Leader's Father
James Finnegan
Bald Man
Rosanna Hoult
David's Wife
Kathy Kelly
Police Officer 1
Kevin McCormack
Police Officer 2
Jacqueline Abrahams
Donkey Shooter
Garry Mountaine
Hotel Manager's Partner
Ewen MacIntosh
Trainer Waiter (Shooting Range)
Patrick Malone
Campari Man
Sandra Hayden Mason
Arrested Town Woman
Judi King Murphy
Guest Room 104
Laoise Murphy
New Daughter
Nancy Onu
Hotel Receptionist
Chris Threader
Coach Driver Waiter
Ishmael Moalosi
Bandaged Loner
Matthew O'Brien
Trapped Loner
Robert Heaney
Restaurant Waiter
Cian Boylan
Piano Player (uncredited)
Clive Dev
Hotel Guest (uncredited)
Degnan Geraghty
Waiter (uncredited)
Heidi Ellen Love
Waitress (uncredited)
Dolores Marren
Waitress (uncredited)
Mark McCormack
Waiter (uncredited)
Stephen Ryan
Hotel Guest (uncredited)