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.
Harry Potter and the Chamber of Secrets
2002
Harry Potter and the Prisoner of Azkaban
2004
Harry Potter and the Goblet of Fire
2005
Harry Potter and the Half-Blood Prince
2009
Harry Potter and the Order of the Phoenix
2007
Harry Potter and the Deathly Hallows: Part 2
2011
Harry Potter and the Deathly Hallows: Part 1
2010
101 Dalmatians
1996
Exit Wounds
2001
Harry Potter 20th Anniversary: Return to Hogwarts
2022
Stardust
2007
The Borrowers
1997
We're Going on a Bear Hunt
2016
The Fast Show Live
1998
Shakespeare in Love
1998
Dragon Fight
1989
Harry Potter: A History Of Magic
2017
Agent Cody Banks 2: Destination London
2004
Early Man
2018
Frankenstein's Wedding... Live in Leeds
2011
Albert Nobbs
2011
High Heels and Low Lifes
2001
50 Greatest Harry Potter Moments
2011
When Harry Left Hogwarts
2011
A Cock and Bull Story
2005
The Fast Show: The Farewell Tour
2003
The Look of Love
2013
Prince of Jutland
1994
Steve Coogan: The Inside Story
2009
The Heart of Me
2004
Tumbledown
1988
The Final Curtain
2002
Viva Blackpool
2006
Whatever Happened to Harold Smith?
2000
Golden Years
2016
Dream Hacker
2025
Robin and the Hoods
2024
Suit You Sir! The Inside Leg Of The Fast Show
1999
Ted & Ralph
1998