
Brían F. O'Byrne
Biography
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

Mapmaker
2001 · 9.0
Hallmark Hall of Fame
1951 · 8.8

Oz
1997 · 8.0

Law & Order: Special Victims Unit
1999 · 8.0

Avenue X
1993 · 8.0

Million Dollar Baby
2004 · 8.0

Manhunt
2017 · 7.6

The Magicians
2015 · 7.6

Little Boy Blue
2017 · 7.6

Love/Hate
2010 · 7.5

Lincoln Rhyme: Hunt for the Bone Collector
2020 · 7.4

Conclave
2024 · 7.2

Before the Devil Knows You're Dead
2007 · 7.1

FlashForward
2009 · 7.0

Mildred Pierce
2011 · 7.0

Task
2025 · 7.0

Amongst Women
1998 · 7.0

The Last Ship
2014 · 6.9

Brotherhood
2006 · 6.8

No Reservations
2007 · 6.7

Jimmy's Hall
2014 · 6.7

The Grey Zone
2001 · 6.6

The Wonder
2022 · 6.6

Dead of Winter
2025 · 6.5

The New World
2005 · 6.5

American Experience
1988 · 6.5

Aquarius
2015 · 6.5

Sergio
2020 · 6.5

Saints & Strangers
2015 · 6.4

My Salinger Year
2020 · 6.3

Prime Suspect
2011 · 6.3

Brooklyn's Finest
2010 · 6.3

Bandits
2001 · 6.3

The International
2009 · 6.3

Intermission
2003 · 6.2

Bug
2007 · 6.1

Queen & Country
2015 · 6.1

The Blackwater Lightship
2004 · 6.1

Hatton Garden
2019 · 6.0

The Fifth Province
1997 · 6.0

The Abandons
2025 · 5.9

An Everlasting Piece
2000 · 5.9

Prisoner
2026 · 5.8

Disco Pigs
2001 · 5.8

Nightflyers
2018 · 5.7

The Bastard Executioner
2015 · 5.7

Medeas
2013 · 5.7

Easy
2003 · 5.7

Alexander Hamilton
2007 · 5.6

Season of the Witch
2011 · 5.5

The Last Bus Home
1997 · 3.0
Seahorse
— · 0.0

One Sweet Hour
2026 · 0.0

Twig
2024 · 0.0