
Brían F. O'Byrne
Acting
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.
Known for

FlashForward
2009 · TV

Law & Order: Special Victims Unit
1999 · TV

Aquarius
2015 · TV

Love/Hate
2010 · TV

Prime Suspect
2011 · TV

Lincoln Rhyme: Hunt for the Bone Collector
2020 · TV

The Last Ship
2014 · TV

Nightflyers
2018 · TV

Manhunt
2017 · TV

Prisoner
2026 · TV

The Abandons
2025 · TV

Mildred Pierce
2011 · TV

Little Boy Blue
2017 · TV

Amongst Women
1998 · TV

Hatton Garden
2019 · TV

The Magicians
2015 · TV

Saints & Strangers
2015 · TV

Oz
1997 · TV

American Experience
1988 · TV

Hallmark Hall of Fame
1951 · TV

Brotherhood
2006 · TV

The Bastard Executioner
2015 · TV