Dev Patel

Character: Gawain

Alicia Vikander

Character: Lady / Essel

Joel Edgerton

Character: Lord

Sarita Choudhury

Character: Mother

Sean Harris

Character: King

Kate Dickie

Character: Queen

Barry Keoghan

Character: Scavenger

Erin Kellyman

Character: Winifred

Ralph Ineson

Character: Green Knight

Emilie Hetland

Character: First Thief

Anthony Morris

Character: Second Thief

Megan Tiernan

Character: The Young Queen

Helena Browne

Character: Sightless Woman

Brendan Conroy

Character: Taverngoer

Chris McHallem

Character: Lord in Waiting

Atheena Frizzell

Character: Youngest Sister

Donncha Crowley

Character: Bishop

Noelle Brown

Character: Madam

Anaïs Rizzo

Character: Helen

Joe Anderson

Character: Paris

Nita Mishra

Character: Older Sister

Tara Mae

Character: Middle Sister

Sam Uppal Lynch

Character: Prince Age 7

Adam Karim

Character: Prince Age 17

Ruth Patel

Character: Princess Age 4

Rose Patel

Character: Princess Age 6

Emmet O'Brien

Character: Magician

Andrea Deaskovic

Character: Giant

Aoibheann Garry

Character: Giant

Isabel Friosi

Character: Giant

Hannah Sjoden

Character: Giant

Lucy Waters

Character: Giant

Melinda Dempsey

Character: Giant

Rachel Quinn

Character: Giant

Ethan Dillion

Character: Soldier #1 (uncredited)

Aaron Edo

Character: Soldier #2 (uncredited)

Youssef Quinn

Character: Soldier #3 (uncredited)

Patrick Duffy

Character: Gawain's Friend in Tavern (uncredited)

Janet Grene

Character: Townsfolk (uncredited)

Tom Leavey

Character: Knight of the Round Table (uncredited)

Stuart Mackey

Character: Lancer (uncredited)

Aoife Gaffney

Character: Girl at Round Table (uncredited)