Peter Mullan (; born 2 November 1959) is a Scottish actor and filmmaker. His credits include Riff-Raff (1991), Shallow Grave (1994), Braveheart (1995), Trainspotting (1996), My Name Is Joe (1998), The Claim (2000), Neds (2010), War Horse (2011), The Fixer (2008), Top of the Lake (2013), Mum (2016–2019), Ozark (2017–2018), Westworld (2018–2020), Cursed (2020), The North Water (2021), The Underground Railroad (2021), The Lord of the Rings: The Rings of Power (2022–2024), After the Party (2023), Baghead (2023) and I Swear (2025).
He won a Golden Lion at 59th Venice International Film Festival for his direction of The Magdalene Sisters (2002).
Peter Mullan was born in Peterhead, Aberdeenshire, Scotland, the son of Patricia (a nurse) and Charles Mullan (a lab technician at Glasgow University). The seventh of eight children, Mullan was brought up in a working class Roman Catholic family. They later moved to Mosspark, a district in Glasgow. Mullan's father, an alcoholic, became increasingly tyrannical and abusive; he died from lung cancer when Mullan was 17.
For a brief period, Mullan was a member of a street gang while at secondary school, and worked as a bouncer in a number of south-side pubs. He was homeless for short periods at the ages of 15 and 18.
Mullan went on to the University of Glasgow to study economic history and drama, and where he also began acting on stage.
Mullan continued stage acting after graduation. He had roles in films alongside actors such as Robert Carlyle in Riff-Raff (1991), with Mel Gibson in Braveheart (1995), and with Ewan McGregor in Danny Boyle's Shallow Grave (1994) and Trainspotting (1996).
Mullan's role as a recovering alcoholic in My Name Is Joe (1998) won him the Best Actor Award at the 1998 Cannes Film Festival.
As a director, his film, Orphans (1998), won awards at the Venice Film Festival 1998 and Festival du Film de Paris 1999.
He won the World Dramatic Special Jury Prize for Breakout Performances at 2011 Sundance Film Festival for his work on Paddy Considine's Tyrannosaur (2011).
Mullan has appeared as supporting or guest actor in numerous cult movies, including Session 9 (2002),Young Adam (2003), Children of Men (2006), Harry Potter and the Deathly Hallows – Part 1 (2010), and War Horse (2011).
In television, he played a lead role in the 2008 ITV series The Fixer. Mullan appeared in Gerard Lee's and Jane Campion's 2013 miniseries Top of the Lake as Matt Mitcham, head of the Mitcham family and father of Tui Mitcham, whose disappearance is the main topic of the series. He was nominated for a Primetime Emmy Award for his work in the series. From 2016 to 2019, he starred in the BBC Two sitcom Mum, and from 2017 to 2018, Mullan appeared in the first two seasons of the Netflix series Ozark. In 2018 and 2020, he starred in the second and third season of HBO's Westworld, in a recurring and guest capacity respectively. Also in 2020, he starred in the first season of the Netflix series Cursed.
Mullan appeared in the 2021 miniseries The North Water and The Underground Railroad. He also starred as Dwarf king Durin III in the Amazon Prime Video series The Lord of the Rings: The Rings of Power, which premiered in 2022.
In 2023, he starred in the New Zealand drama series After the Party, and alongside Freya Allan in Baghead (2023).
In March 2026, it was announced that Mullan had been cast as Ser Eustace Osgrey in the second season of A Knight of the Seven Kingdoms.
Mullan is an arthouse movie director. In 2002, he returned to directing and screenwriting with the controversial film The Magdalene Sisters, based on life in an Irish Magdalene asylum. He won a Golden Lion at 59th Venice International Film Festival for the film, listed by many critics among the best films of 2003 and nominated for BAFTA Award for Best British Film, and European Film Award for best film.
He also won a Golden Shell at San Sebastián International Film Festival for Neds (2010).
He won top prizes both for acting (Cannes Best Actor award for My Name Is Joe) and for the best film (Golden Lion for The Magdalene Sisters) at major European film festivals.
Mullan married Ann Swan, an actress and scriptwriter, in 1989; they divorced in 2006. He has four children – three with Swan, including one son with autism, and one with former girlfriend, activist Robina Qureshi. He is in a relationship with New Zealand actress Robyn Malcolm, whom he met while filming Top of the Lake in 2013.