Andrea Riseborough

Character: Colette McVeigh

Clive Owen

Character: Mac

Gillian Anderson

Character: Kate Fletcher

Aidan Gillen

Character: Gerry

Domhnall Gleeson

Character: Connor

Brid Brennan

Character: Ma

David Wilmot

Character: Kevin Mulville

Stuart Graham

Character: Ian Gilmour

Martin McCann

Character: Brendan

Maria Laird

Character: Young Collette

Barry Barnes

Character: Gerry Senior

Michael McElhatton

Character: Liam Hughes

Gary Lydon

Character: Geoff

Daniel Tatarsky

Character: Watcher

Tom Bennett

Character: Watcher #2

Nicholas Asbury

Character: Agent

Morgan Watkins

Character: MI5 Officer

Karl Shiels

Character: Mulville's Driver / Gunman

Mark Huberman

Character: RUC Officer at Hospital

Ronnie McCann

Character: RUC Constable

Eoin Murtagh

Character: Louie, Fletcher's Son

Alan Devine

Character: Social Club Barman

Ben Smyth

Character: Sean

Nia Gwynne

Character: Female Watcher

Cathal Maguire

Character: Mark

Ian Patterson

Character: News Reporter

Alan O'Neill

Character: RUC Officer

David Herlihy

Character: Senior Staff Officer

Frank Smith

Character: Henderson

Kate Nic Chonaonaigh

Character: Henderson's Wife

Lisa Walsh

Character: Brendan's Girlfriend

Una Carroll

Character: Brendan's Mum

James Greene

Character: British Soldier (uncredited)

Anna Elizabeth McGrath

Character: Mourner (uncredited)

Anne Brogan

Character: Bridget