Dev Patel
Gawain
Alicia Vikander
Lady / Essel
Joel Edgerton
Lord
Sarita Choudhury
Mother
Sean Harris
King
Kate Dickie
Queen
Barry Keoghan
Scavenger
Erin Kellyman
Winifred
Ralph Ineson
Green Knight
Emilie Hetland
First Thief
Anthony Morris
Second Thief
Megan Tiernan
The Young Queen
Helena Browne
Sightless Woman
Brendan Conroy
Taverngoer
Chris McHallem
Lord in Waiting
Atheena Frizzell
Youngest Sister
Donncha Crowley
Bishop
Noelle Brown
Madam
Anaïs Rizzo
Helen
Joe Anderson
Paris
Nita Mishra
Older Sister
Tara Mae
Middle Sister
Sam Uppal Lynch
Prince Age 7
Adam Karim
Prince Age 17
Ruth Patel
Princess Age 4
Rose Patel
Princess Age 6
Emmet O'Brien
Magician
Andrea Deaskovic
Giant
Aoibheann Garry
Giant
Isabel Friosi
Giant
Hannah Sjoden
Giant
Lucy Waters
Giant
Melinda Dempsey
Giant
Rachel Quinn
Giant
Ethan Dillion
Soldier #1 (uncredited)
Aaron Edo
Soldier #2 (uncredited)
Youssef Quinn
Soldier #3 (uncredited)
Patrick Duffy
Gawain's Friend in Tavern (uncredited)
Janet Grene
Townsfolk (uncredited)
Tom Leavey
Knight of the Round Table (uncredited)
Stuart Mackey
Lancer (uncredited)
Aoife Gaffney
Girl at Round Table (uncredited)