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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.

The Secret Santa Project
as Leon

Dream Hacker
as Edgar Wainwright

Robin and the Hoods
as The Mayor

Surprised by Oxford
as Professor Nuttham

The Effects of Lying

Fantastic Friends
as Self

Super Villans
as Self

Here We Go
as Frank

Sister Boniface Mysteries
as Father Brown

Harry Potter 20th Anniversary: Return to Hogwarts
as Self

The Fast Show: More Blooming Catchphrases
as Self/Various Characters

Early Man
as Barry (voice)

Heidi: Queen of the Mountain
as Henry

Harry Potter: A History Of Magic
as Himself

We're Going on a Bear Hunt
as Dad (voice)

Golden Years
as Phil

Red Top
as Police Commissioner Hamish Pritchard
Born Naughty?
as Self - Narrator (voice)

The Musketeers
as Pathologist

The Look of Love
as Follies Director

Father Brown
as Father Brown

Blandings
as Sebastian Beach

Albert Nobbs
as Sean Casey

When Harry Left Hogwarts
as Self

50 Greatest Harry Potter Moments
as Arthur Weasley (archive footage)

Harry Potter and the Deathly Hallows: Part 2
as Arthur Weasley
Fern

Frankenstein's Wedding... Live in Leeds
as Alphonse Frankenstein

Little Crackers
as Father Christmas

Harry Potter and the Deathly Hallows: Part 1
as Arthur Weasley

The Indian Doctor
as Richard Sharpe

Steve Coogan: The Inside Story
as Self

Harry Potter and the Half-Blood Prince
as Arthur Weasley

Being Human
as Regus

Merlin
as The Goblin (voice)
A Room with a View
as Mr Beebe

Sense and Sensibility
as Sir John Middleton

A Room with a View
as Mr Beebe

Stardust
as Billy

Harry Potter and the Order of the Phoenix
as Arthur Weasley

Saxondale: On The Road
as Self

The One Show
as Self

Saxondale
as Deggsy

Viva Blackpool
as Tommy Vesty

The World's Strangest UFO Stories
as Self - Narrator (voice)

Harry Potter and the Goblet of Fire
as Arthur Weasley

A Cock and Bull Story
as Ingoldsby

Doctor Who
as Brian Williams

The Rotters' Club
as Sam Williams

Agatha Christie's Marple
as Commander Peters
Carrie & Barry
as Kirk

Harry Potter and the Prisoner of Azkaban
as Arthur Weasley

Mark Williams On The Rails
as Self - Presenter

Agent Cody Banks 2: Destination London
as Inspector Crescent

Hustle
as Dale Ridley

The Heart of Me
as Man

New Tricks
as David Beaumont

The Fast Show: The Farewell Tour
as Various
Star
as Mr Fisher

Anita and Me
as The Reverend 'Uncle' Alan