
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.
Known For

Law & Order: Special Victims Unit
1999 · tv

Oz
1997 · tv

American Experience
1988 · tv

The Last Ship
2014 · tv

The Magicians
2015 · tv

Dead of Winter
2025 · movie

FlashForward
2009 · tv

Manhunt
2017 · tv

Conclave
2024 · movie

Million Dollar Baby
2004 · movie

The Abandons
2025 · tv

Brotherhood
2006 · tv

The International
2009 · movie

Aquarius
2015 · tv

Love/Hate
2010 · tv

Lincoln Rhyme: Hunt for the Bone Collector
2020 · tv

Before the Devil Knows You're Dead
2007 · movie

Bandits
2001 · movie

Mildred Pierce
2011 · tv

Brooklyn's Finest
2010 · movie

Prime Suspect
2011 · tv

The New World
2005 · movie

Nightflyers
2018 · tv

No Reservations
2007 · movie

The Bastard Executioner
2015 · tv

Sergio
2020 · movie

Intermission
2003 · movie

The Grey Zone
2001 · movie

Bug
2007 · movie

The Fifth Province
1997 · movie