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
Cast Credits

Dead of Winter
Character: Tall Hunter
MOVIE • 2025

Conclave
Character: O'Malley
MOVIE • 2024

Twig
Character: Leon
MOVIE • 2024

The Wonder
Character: John Flynn
MOVIE • 2022

My Salinger Year
Character: Hugh
MOVIE • 2020

Sergio
Character: Gil Loescher
MOVIE • 2020

Lincoln Rhyme: Hunt for the Bone Collector
Character: The Bone Collector
TV • 2020

Hatton Garden
Character: Basil
TV • 2019

Nightflyers
Character: Auggie
TV • 2018

Manhunt
Character: Frank McAlpine
TV • 2017

Little Boy Blue
Character: Steve Jones
TV • 2017

The Magicians
Character: Mayakovsky
TV • 2015

Saints & Strangers
Character: John Billington
TV • 2015

The Bastard Executioner
Character: Baron Ventris
TV • 2015

Aquarius
Character: Ken Karn
TV • 2015

Queen & Country
Character: RSM Digby
MOVIE • 2014

The Last Ship
Character: Sean Ramsey
TV • 2014

Jimmy's Hall
Character: Commander O'Keefe
MOVIE • 2014

Medeas
Character: Ennis
MOVIE • 2013

Gilded Lilys
Character: Edwin Lily
MOVIE • 2013