Allen Leech (born 18 May 1981) is an Irish actor best known for his role as Tom Branson on the historical drama series Downton Abbey (2010–2015). He made his professional acting debut with a small part in a 1998 production of A Streetcar Named Desire, made his first major film appearance as Vincent Cusack in Cowboys & Angels, and earned an Irish Film & Television Awards nomination in 2004 with his performance as Mo Chara in Man About Dog.
He appeared as Willi in the Queen and Peacock (2000), at the Garter Lane Arts Centre. The following years, he was in The Morning After Optimism (2001) and then Da (2002). His breakthrough film performance was in Cowboys and Angels (2003), followed by a role in the 2004 cross-country caper film Man About Dog. He played the role of Shane Kirwan in Ireland's RTÉ series Love Is the Drug (2004), for which he received a Best Actor nomination from the Irish Film and Television Awards. He followed that up with the role of Willy in the television series Legend (2006), for which he received a Best Supporting Actor nomination from Irish Film and Television Awards.
In 2010, he appeared on the small screen in The Tudors (2010) as the doomed Francis Dereham. Leech also appeared in ITV 2010s television series Downton Abbey as chauffeur Tom Branson. He played the role of officer Sam Leonard in television series Primeval in 2011 in series five. He also starred in the 2012 film adaptation The Sweeney. In 2014 he starred as the spy John Cairncross, in The Imitation Game. He played Freddie Mercury's personal manager, Paul Prenter, in the biopic Bohemian Rhapsody (2018), which earned him a nomination for Outstanding Performance by a Cast in a Motion Picture at the 25th Screen Actors Guild Awards.
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Downton Abbey: The Grand Finale
Tom Branson
2025
BULLDOZER
Greg Roddy · (1 episode)
2025

You Can't Run Forever
Eddie
2024

Cold Meat
David
2024

Too Good to Be True
Elliott Fielding · (4 episodes)
2024

The Vanishing Triangle
Detective David Burkely · (6 episodes)
2023

My Name Is Andrea
Lover's Husband
2022

Downton Abbey: A New Era
Tom Branson
2022

As Luck Would Have It
Brennan
2021

A Little Late with Lilly Singh
Self · (1 episode)
2019

Downton Abbey
Tom Branson
2019

The Kelly Clarkson Show
(1 episode)
2019

Doing Money
Dougie
2019

Bohemian Rhapsody
Paul Prenter
2018

The Good Doctor
Ariel Reznik · (1 episode)
2017

The Hunter's Prayer
Richard Addison
2017

Bellevue
Eddie Roe · (8 episodes)
2017

The Imitation Game
John Cairncross
2014

Grand Piano
Wayne
2013

In Fear
Max
2013

The Sweeney
DC Simon Ellis
2012

Black Mirror
Pike · (1 episode)
2011

Downton Abbey
Tom Branson · (40 episodes)
2010

Rewind
Karl
2010

From Time to Time
Fred Boggis
2009

Watch What Happens Live with Andy Cohen
Self - Guest · (3 episodes)
2009

Factory Farmed
2008

Attila the Hun
Edeco
2008

Heroes and Villains
Edeco · (1 episode)
2007
Deep Breaths
2007

The Tudors
Francis Dereham · (3 episodes)
2007

Primeval
(1 episode)
2007

Rome
Marcus Vipsanius Agrippa · (8 episodes)
2005

Love Is The Drug
Shane Kirwan · (4 episodes)
2004

Man About Dog
Mo Chara
2004

Cowboys & Angels
Vincent
2004

Benedict Arnold: A Question of Honor
British Officer
2003

The Escapist
Policeman 1 (Smashed Car)
2002

Iníon an Fhiaclóra
Rory
2000
IGNIS

The View
Self - Guest · (1 episode)
1997

The View
Self · (1 episode)
1997