Mark Williams
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Mark Williams (born August 22, 1959) is an English actor, comedian, presenter and screenwriter. He first achieved widespread recognition as one of the central performers in the popular BBC sketch show The Fast Show. His film roles include Horace in the 1996 adaptation of 101 Dalmatians and Arthur Weasley in seven of the Harry Potter films. He made recurring appearances as Brian Williams in the BBC television series Doctor Who and as Olaf Petersen in Red Dwarf. Since 2013, Williams has portrayed the title character in the long-running BBC series loosely based on the Father Brown short stories by G. K. Chesterton.
Known for
Credits
Harry Potter and the Deathly Hallows: Part 2 (2011)
as Arthur Weasley
Harry Potter and the Chamber of Secrets (2002)
as Arthur Weasley
Harry Potter and the Prisoner of Azkaban (2004)
as Arthur Weasley
Harry Potter and the Goblet of Fire (2005)
as Arthur Weasley
Harry Potter and the Order of the Phoenix (2007)
as Arthur Weasley
Harry Potter and the Half-Blood Prince (2009)
as Arthur Weasley
Harry Potter and the Deathly Hallows: Part 1 (2010)
as Arthur Weasley
101 Dalmatians (1996)
as Horace
Harry Potter 20th Anniversary: Return to Hogwarts (2022)
as Self
Stardust (2007)
as Billy
Shakespeare in Love (1998)
as Wabash
Early Man (2018)
as Barry (voice)
Exit Wounds (2001)
as Cop
Red Top (2016)
as Police Commissioner Hamish Pritchard
A Cock and Bull Story (2005)
as Ingoldsby
The Borrowers (1997)
as Exterminator Jeff
Agent Cody Banks 2: Destination London (2004)
as Inspector Crescent
50 Greatest Harry Potter Moments (2011)
as Arthur Weasley (archive footage)
The Fast Show: You Ain’t Seen These, Right? (1999)
Actor
Albert Nobbs (2011)
as Sean Casey
High Heels and Low Lifes (2001)
as Tremaine
The Fast Show: More Blooming Catchphrases (2020)
as Self/Various Characters
Anita and Me (2002)
as The Reverend 'Uncle' Alan
Dick Whittington: The ITV Pantomime (2002)
as King Rat
Harry Potter: A History Of Magic (2017)
as Himself
The Look of Love (2013)
as Follies Director
Robin and the Hoods (2024)
as The Mayor
We're Going on a Bear Hunt (2016)
as Dad (voice)
When Harry Left Hogwarts (2011)
as Self
The Heart of Me (2004)
as Man
Super Villans (2022)
as Self
The Storyteller: Fearnot (1988)
as Fearnot's Brother
Fever (1994)
as Jukebox Man
Whatever Happened to Harold Smith? (2000)
as Roland Thornton
A Room with a View (2007)
as Mr Beebe
The Final Curtain (2002)
as Declan Farrell
Prince of Jutland (1994)
as Aslak
Tumbledown (1988)
as Lumpy
Surprised by Oxford (2023)
as Professor Nuttham
The Dark Channel (2021)
as Mabuse
Dream Hacker (2025)
as Edgar Wainwright
Golden Years (2016)
as Phil
Viva Blackpool (2006)
as Tommy Vesty
Steve Coogan: The Inside Story (2009)
as Self
Second Star to the Left (2001)
as Duke (voice)
The Effects of Lying (2023)
Actor
The Secret Santa Project (2025)
as Leon
Hunting Venus (1999)
as Peter
The Fast Show Live (1998)
Actor
Suit You Sir! The Inside Leg Of The Fast Show (1999)
as Self
The Big Game (1995)
as Tommy Hollis
Frankenstein's Wedding... Live in Leeds (2011)
as Alphonse Frankenstein
Ted & Ralph (1998)
as Confirmed Bachelor
The Fast Show: The Farewell Tour (2003)
as Various
Saxondale: On The Road (2006)
as Self
Privileged (1982)
as Wilf
Coppers (1988)
Actor
Happy Birthday Shakespeare (2000)
as Ted
Combat Sheep (2001)
as Moose (voice)
Heidi: Queen of the Mountain (2017)
as Henry
Lead Heads (—)
Actor
The Dudley Bug (—)
as Roderick the Palaeontologist