
Brían F. O'Byrne
Acting
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.
TV Shows(22)

Prisoner
Harrison Dempsey
2026

The Abandons
Walter Paxton
2025

Lincoln Rhyme: Hunt for the Bone Collector
The Bone Collector
2020

Hatton Garden
Basil
2019

Nightflyers
Auggie
2018

Manhunt
Frank McAlpine
2017

Little Boy Blue
Steve Jones
2017

The Magicians
Mayakovsky
2015

Saints & Strangers
John Billington
2015

The Bastard Executioner
Baron Ventris
2015

Aquarius
Ken Karn
2015

The Last Ship
Sean Ramsey
2014

Prime Suspect
Reg Duffy
2011

Mildred Pierce
Bert Pierce
2011

Love/Hate
Inpector Mick Moynihan
2010

FlashForward
Aaron Stark
2009

Brotherhood
Colin
2006

Law & Order: Special Victims Unit
Liam Connors
1999

Amongst Women
Luke
1998

Oz
Padraic Connelly
1997

American Experience
Alexander Hamilton
1988

Hallmark Hall of Fame
Larry
1951
Movies(31)

Dead of Winter
Tall Hunter
2025

Conclave
O'Malley
2024

Twig
Leon
2024

The Wonder
John Flynn
2022

My Salinger Year
Hugh
2020

Sergio
Gil Loescher
2020

Queen & Country
RSM Digby
2015

Jimmy's Hall
Commander O'Keefe
2014

Medeas
Ennis
2013

Gilded Lilys
Edwin Lily
2013

Brooklyn's Finest
Det. Ronny Rosario
2010

The International
The Consultant
2009

Before the Devil Knows You're Dead
Bobby Lasorda
2007

No Reservations
Sean
2007

Alexander Hamilton
Alexander Hamilton
2007

Bug
Dr. Sweet
2007

The New World
Lewes
2005

Million Dollar Baby
Father Horvak
2004

The Blackwater Lightship
Larry
2004

Easy
Mick McCabe
2003

Intermission
Mick
2003

Mapmaker
Richie Markey
2001

Bandits
Darill Miller
2001

Disco Pigs
Gerry
2001

The Grey Zone
Interrogator
2001

An Everlasting Piece
George
2000

The Fifth Province
Timmy
1997

The Last Bus Home
Jessop
1997

Avenue X
Sonny
1993

One Sweet Hour
Seahorse
George