Helen

Anais Rizzo

Gawain

Dev Patel

Paris

Joe Anderson

Essel/The Lay

Alicia Vikander

The Lord

Joel Edgerton

Mother

Sarita Choudhury

King

Sean Harris

Madam

Noelle Brown

Green Knight

Ralph Ineson

Queen

Kate Dickie

Older Sister

Nita Mishra

Scavenger

Barry Keoghan

Middle Sister

Tara McDonagh

Winifred

Erin Kellyman

Youngest Sister

Atheena Frizzell

Sightless Woman

Helena Browne

First Thief

Emilie Hetland

Second Thief

Anthony Morris

The Young Queen

Megan Tiernan

Lord in Waiting

Chris McHallem

Magician

Emmet O'Brien

Taverngoer

Brendan Conroy

Soldier #3

Youssef Quinn

Soldier #2

Aaron Edo

Bishop

Donncha Crowley

Noble

Tyrone Kearns

Soldier #1

Ethan Dillion

Middle Sister

Tara Mae

Prince Age 7

Sam Uppal Lynch

Prince Age 17

Adam Karim

Princess Age 4

Ruth Patel

Princess Age 6

Rose Patel

Giant

Rachel Quinn

Townsfolk (uncredited)

Janet Grene

Knight of the Round Table (uncredited)

Tom Leavey

Lancer (uncredited)

Stuart Mackey

Girl at Round Table (uncredited)

Aoife Gaffney