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Actor · Acting

Brían F. O'Byrne

Born 1967-05-16
📍 Mullagh, County Cavan, Ireland

Brían Francis O'Byrne (born 16 May 1967) is an Irish actor who works mostly in the United States. He was born in Mullagh, County Cavan.  O'Byrne first attracted notice for his performances in the Martin McDonagh plays The Beauty Queen of Leenane (1996) as Pato Dooley (for which he received a Tony Award nomination for Best Featured Actor in a Play) and The Lonesome West (1997). He is known for taking on serious and dramatic roles, such as a serial killer in Frozen (1998) (for which he won a Tony Award) and a priest accused of child molestation in Doubt (2004), for which he received a Tony nomination. O'Byrne also appeared as a priest in the 2004 film Million Dollar Baby. In May 2007, O'Byrne was nominated for a Tony Award for his performance as Alexander Herzen in Tom Stoppard's 2002 trilogy The Coast of Utopia. In 2011, he was nominated for the Primetime Emmy Award for Outstanding Supporting Actor in a Miniseries or a Movie for his performance in Mildred Pierce as Bert Pierce.

Filmography 52

Prisoner
as Harrison Dempsey
2026
The Abandons
as Walter Paxton
2025
Dead of Winter
as Tall Hunter
2025
Conclave
as O'Malley
2024
Twig
as Leon
2024
The Wonder
as John Flynn
2022
My Salinger Year
as Hugh
2020
Sergio
as Gil Loescher
2020
Lincoln Rhyme: Hunt for the Bone Collector
as The Bone Collector
2020
Hatton Garden
as Basil
2019
Nightflyers
as Auggie
2018
Manhunt
as Frank McAlpine
2017
Little Boy Blue
as Steve Jones
2017
The Magicians
as Mayakovsky
2015
Saints & Strangers
as John Billington
2015
The Bastard Executioner
as Baron Ventris
2015
Aquarius
as Ken Karn
2015
Queen & Country
as RSM Digby
2015
The Last Ship
as Sean Ramsey
2014
Jimmy's Hall
as Commander O'Keefe
2014
Medeas
as Ennis
2013
Gilded Lilys
as Edwin Lily
2013
Prime Suspect
as Reg Duffy
2011
Mildred Pierce
as Bert Pierce
2011
Love/Hate
as Inpector Mick Moynihan
2010
Brooklyn's Finest
as Det. Ronny Rosario
2010
FlashForward
as Aaron Stark
2009
The International
as The Consultant
2009
Before the Devil Knows You're Dead
as Bobby Lasorda
2007
No Reservations
as Sean
2007
Alexander Hamilton
as Alexander Hamilton
2007
Bug
as Dr. Sweet
2007
Brotherhood
as Colin
2006
The New World
as Lewes
2005
Million Dollar Baby
as Father Horvak
2004
The Blackwater Lightship
as Larry
2004
Easy
as Mick McCabe
2003
Intermission
as Mick
2003
Mapmaker
as Richie Markey
2001
Bandits
as Darill Miller
2001
Disco Pigs
as Gerry
2001
The Grey Zone
as Interrogator
2001
An Everlasting Piece
as George
2000
Law & Order: Special Victims Unit
as Liam Connors
1999
Amongst Women
as Luke
1998
The Fifth Province
as Timmy
1997
The Last Bus Home
as Jessop
1997
Oz
as Padraic Connelly
1997
Avenue X
as Sonny
1993
American Experience
as Alexander Hamilton
1988
Hallmark Hall of Fame
as Larry
1951
One Sweet Hour
as Colum Byrne