Name	Known for
Sam Neill Merlin Merlin See fewer	Jurassic Park (1993)
Helena Bonham Carter Morgan Le Fey Morgan Le Fey See fewer	Sweeney Todd: The Demon Barber of Fleet Street (2007)
John Gielgud King Constant King Constant See fewer	Arthur (1981)
Rutger Hauer King Vortigern King Vortigern See fewer	Hobo with a Shotgun (2011)
James Earl Jones Mountain King (voice) Mountain King (voice) See fewer	Rogue One: A Star Wars Story (2016)
Miranda Richardson Queen Mab / Lady of the Lake Queen Mab / Lady of the Lake See fewer	The Crying Game (1992)
Isabella Rossellini Nimue Nimue See fewer	Blue Velvet (1986)
Martin Short Frik Frik See fewer	Innerspace (1987)
Paul Curran Arthur Arthur See fewer	Wolf Creek (2005)
Lena Headey Guinevere Guinevere See fewer	300 (2006)
Jeremy Sheffield Lancelot Lancelot See fewer	The Wedding Date (2005)
Mark Jax Uther Uther See fewer	Merlin (1998)
John McEnery Lord Ardente Lord Ardente See fewer	Romeo and Juliet (1968)
Thomas Lockyer Cornwall Cornwall See fewer	Dog Soldiers (2002)
Jason Done Mordred Mordred See fewer	Merlin (1998)
Billie Whitelaw Ambrosia Ambrosia See fewer	The Omen (1976)
Daniel Brocklebank Young Merlin Young Merlin See fewer	The Hole (2001)
Agnieszka Koson Young Nimue Young Nimue See fewer	Merlin (1998)
Emma Lewis Elissa Elissa See fewer	The Remains of the Day (1993)
Justin Girdler Young Galahad Young Galahad See fewer	Merlin (1998)
Roger Ashton-Griffiths Sir Boris Sir Boris See fewer	Game of Thrones (2011)
Nicholas Clay Lord Leo Lord Leo See fewer	Excalibur (1981)
Sebastian Roché Gawin Gawin See fewer	1923 (2022)
Rachel de Thame Lady Igraine (as Rachel Colover) Lady Igraine (as Rachel Colover) See fewer	Merlin (1998)
John Turner Lord Lot Lord Lot See fewer	Corrigan Blake (1962)
Keith Baxter Sir Hector Sir Hector See fewer	Chimes at Midnight (1965)
Janine Eser Lady Elaine Lady Elaine See fewer	Madiba (2017)
Peter Woodthorpe Soothsayer Soothsayer See fewer	The Lord of the Rings (1978)
Robert Addie Sir Gilbert Sir Gilbert See fewer	Excalibur (1981)
Nickolas Grace Sir Egbert Sir Egbert See fewer	Robin Hood (1984)
Peter Benson 1st Architect 1st Architect See fewer	Albion Market (1985)
John Tordoff New Architect New Architect See fewer	Robin Hood: Prince of Thieves (1991)
Timothy Bateson Father Abbot Father Abbot See fewer	Harry Potter and the Order of the Phoenix (2007)
Alice Hamilton Young Morgan Young Morgan See fewer	Merlin (1998)
Peter Eyre Chief Physician Chief Physician See fewer	Dragonslayer (1981)
Vernon Dobtcheff 1st Physician 1st Physician See fewer	Indiana Jones and the Last Crusade (1989)
Peter Bayliss 2nd Physician 2nd Physician See fewer	From Russia with Love (1963)
Talula Sheppard Lady Friend Lady Friend See fewer	Merlin (1998)
Harry Whitewood Young Mordred Young Mordred See fewer	Merlin (1998)
Christian Simpson Vortigern's Guard (uncredited) Vortigern's Guard (uncredited) See fewer	Star Wars: Episode VII - The Force Awakens (2015)