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

Roland Ferrandi

Loner Leader's Father

Imelda Nagle Ryan

Loner Leader's Mother

Jacqueline Abrahams

Donkey Shooter

James Finnegan

Bald Man

Robert Heaney

Restaurant Waiter

Rosanna Hoult

David's Wife

Kathy Kelly

Police Officer 1

Kevin McCormack

Police Officer 2

Nancy Onu

Hotel Receptionist

Ewen MacIntosh

Trainer Waiter (Shooting Range)

Patrick Malone

Campari Man

Sandra Hayden Mason

Arrested Town Woman

Garry Mountaine

Hotel Manager's Partner

Laoise Murphy

New Daughter

Ishmael Moalosi

Bandaged Loner

Matthew O'Brien

Trapped Loner

Judi King Murphy

Guest Room 104

Chris Threader

Coach Driver 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)