Colin Farrell

as David

Rachel Weisz

as Short Sighted Woman

Olivia Colman

as Hotel Manager

Léa Seydoux

as Loner Leader

Michael Smiley

as Loner Swimmer

Ariane Labed

as The Maid

John C. Reilly

as Lisping Man

Ben Whishaw

as Limping Man

Angeliki Papoulia

as Heartless Woman

Jessica Barden

as Nosebleed Woman

Emma O'Shea

as Nosebleed Woman's Best Friend

Ashley Jensen

as Biscuit Woman

Roger Ashton-Griffiths

as Doctor

Anthony Dougall

as 70 Year Old Waiter

Anthony Moriarty

as 30 Year Old Waiter

Sean Duggan

as Guard Waiter

Roland Ferrandi

as Loner Leader's Father

Imelda Nagle Ryan

as Loner Leader's Mother

Jacqueline Abrahams

as Donkey Shooter

James Finnegan

as Bald Man

Robert Heaney

as Restaurant Waiter

Rosanna Hoult

as David's Wife

Kathy Kelly

as Police Officer 1

Kevin McCormack

as Police Officer 2

Nancy Onu

as Hotel Receptionist

Ewen MacIntosh

as Trainer Waiter (Shooting Range)

Patrick Malone

as Campari Man

Sandra Hayden Mason

as Arrested Town Woman

Garry Mountaine

as Hotel Manager's Partner

Laoise Murphy

as New Daughter

Ishmael Moalosi

as Bandaged Loner

Matthew O'Brien

as Trapped Loner

Judi King Murphy

as Guest Room 104

Chris Threader

as Coach Driver Waiter

Cian Boylan

as Piano Player (uncredited)

Clive Dev

as Hotel Guest (uncredited)

Degnan Geraghty

as Waiter (uncredited)

Heidi Ellen Love

as Waitress (uncredited)

Dolores Marren

as Waitress (uncredited)

Mark McCormack

as Waiter (uncredited)

Stephen Ryan

as Hotel Guest (uncredited)