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 taki… Read more
Known for Million Dollar Baby 2004 Law & Order: Special Victims Unit 1999 Conclave 2024 Season of the Witch 2011 Series ★ 5.8 Prisoner 2026
Harrison Dempsey ★ 6.4 Dead of Winter 2025
Tall Hunter Series ★ 7 Task 2025
Charlie Boylan Series ★ 5.9 The Abandons 2025
Walter Paxton ★ 7.2 Conclave 2024
O'Malley ★ 6.6 The Wonder 2022
John Flynn ★ 6.6 Sergio 2020
Gil Loescher ★ 6.3 My Salinger Year 2020
Hugh Series ★ 7.4 Lincoln Rhyme: Hunt for the Bone Collector 2020
The Bone Collector Series ★ 5.7 Nightflyers 2018
Auggie Series ★ 7.6 Little Boy Blue 2017
Steve Jones Series ★ 7.6 Manhunt 2017
Frank McAlpine ★ 6.1 Queen & Country 2015
RSM Digby Series ★ 6.5 Aquarius 2015
Ken Karn Series ★ 6.4 Saints & Strangers 2015
John Billington Series ★ 5.7 The Bastard Executioner 2015
Baron Ventris Series ★ 7.6 The Magicians 2015
Mayakovsky ★ 6.7 Jimmy's Hall 2014
Commander O'Keefe Series ★ 6.9 The Last Ship 2014
Sean Ramsey ★ 5.7 Medeas 2013
Ennis ★ 5.5 Season of the Witch 2011
Grandmaster (uncredited) Series ★ 7 Mildred Pierce 2011
Bert Pierce Series ★ 6.3 Prime Suspect 2011
Reg Duffy ★ 6.3 Brooklyn's Finest 2010
Det. Ronny Rosario Series ★ 7.5 Love/Hate 2010
Inpector Mick Moynihan ★ 6.3 The International 2009
The Consultant Series ★ 7 FlashForward 2009
Aaron Stark ★ 6.7 No Reservations 2007
Sean ★ 7.1 Before the Devil Knows You're Dead 2007
Bobby Lasorda ★ 6.1 Bug 2007
Dr. Sweet Series ★ 6.8 Brotherhood 2006
Colin ★ 6.5 The New World 2005
Lewes ★ 8 Million Dollar Baby 2004
Father Horvak ★ 5.7 Easy 2003
Mick McCabe ★ 6.2 Intermission 2003
Mick ★ 6.3 Bandits 2001
Darill Miller ★ 5.8 Disco Pigs 2001
Gerry ★ 6.6 The Grey Zone 2001
Interrogator Series ★ 8 Law & Order: Special Victims Unit 1999
Liam Connors Series ★ 8 Oz 1997
Padraic Connelly Series ★ 6.5 American Experience 1988
Alexander Hamilton 
