Credits

• 2025 · From the World of John Wick: Ballerina as
• 2025 · Four Letters of Love as Muiris Gore
• 2024 · A World War II Fairytale: The Making of Michael Mann's 'The Keep' as Himself (Archive Footage)
• 2023 · Dance First as Samuel Beckett
• 2018 · An L.A. Minute as Ted Gold
• 2018 · In the Cloud as Doc Wolff
• 2018 · Lies We Tell as Donald
• 2017 · Mad to Be Normal as Jim
• 2016 · No Pay, Nudity as Lawrence Rose
• 2013 · Excalibur: Behind the Movie as Self
• 2013 · Just a Sigh as L'homme
• 2011 · A Man's Story as Self
• 2010 · The Women of SNL as Priest (archive footage)
• 2008 · 2:22 as Detective Swain (uncredited)
• 2008 · Emotional Arithmetic as Christopher Lewis
• 2007 · Leningrad as
• 2007 · Attack on Leningrad as Phillip Parker
• 2006 · Played as Eddie
• 2005 · Wah-Wah as Harry Compton
• 2002 · Killing Emmett Young as Jack Marlow / Stephen Bracken
• 2002 · Round Up: Deposing 'The Usual Suspects' as Self
• 2002 · Virginia's Run as Ford Lofton
• 2000 · When Brendan Met Trudy as Special Appearance
• 1998 · Polish Wedding as Bolek
• 1997 · This Is the Sea as Rohan
• 1996 · The Last of the High Kings as Jack Griffin
• 1996 · Mad Dog Time as Ben London
• 1995 · Buffalo Girls as Teddy Blue
• 1994 · Inside the Actors Studio as Self
• 1994 · Out of Ireland: The Story of Irish Emigration to America as Richard O'Gorman (voice)
• 1990 · Dark Obsession as Hugo
• 1988 · Julia and Julia as Paolo
• 1987 · Siesta as Augustine
• 1983 · Hanna K. as Joshué Herzog
• 1980 · The Outsider as Man in Street
• 1980 · Bracken as Pat Barry
• Future · Hamlet Revenant as
• 2024 · Blue Road - The Edna O'Brien Story as Self
• 2022 · The Boy, the Mole, the Fox and the Horse as The Horse (voice)
• 2022 · Lamborghini: The Man Behind the Legend as Enzo Ferrari
• 2022 · Murder at Yellowstone City as Sheriff Ambrose
• 2022 · Walking with Ghosts as Himself
• 2021 · Death of a Ladies' Man as Samuel O'Shea
• 2020 · Michael Des Barres: Who Do You Want Me To Be? as Self
• 2020 · ZeroZeroZero as Edward Lynwood
• 2020 · Lost Girls as Richard Dormer
• 2019 · War of the Worlds as Bill Ward
• 2018 · Cursed: The True Nature of Hereditary as Self - Steve
• 2018 · Maniac as Porter Milgrim
• 2018 · Hereditary as Steve Graham
• 2018 · My Astonishing Self: Gabriel Byrne on George Bernard Shaw as Narrator
• 2018 · Atlantic Salmon: Lost at Sea as Narrator
• 2017 · Into the Night: Portraits of Life and Death as Self
• 2017 · Carrie Pilby as Mr. Pilby
• 2016 · Versus: The Life and Films of Ken Loach as Self - Actor
• 2015 · Endless Night as Bram
• 2015 · Louder Than Bombs as Gene Reed
• 2015 · The 33 as Andre Sougarret
• 2015 · Vikings: Athelstan's Journal as Earl Haraldson (archive footage)
• 2014 · Quirke as Quirke
• 2014 · Vampire Academy as Victor Dashkov
• 2013 · All Things To All Men as Joseph Corso
• 2013 · Vikings as Earl Haraldson
• 2012 · Capital as Dittmar Rigule
• 2012 · Secret State as Tom Dawkins
• 2012 · John Ford: Dreaming the Quiet Man as Narrator
• 2012 · I, Anna as D.C.I. Bernie Reid
• 2009 · Perrier's Bounty as Voice of the Grim Reaper (voice)
• 2009 · Leningrad as Philip Parker
• 2008 · Gabriel Byrne: Stories from Home as
• 2008 · Camelot: Live from Lincoln Center as King Arthur
• 2008 · In Treatment as Dr. Paul Weston
• 2007 · The Graham Norton Show as Self
• 2006 · Jindabyne as Stewart
• 2005 · Assault on Precinct 13 as Captain Marcus Duvall
• 2004 · The Bridge of San Luis Rey as Brother Juniper
• 2004 · P.S. as Peter Harrington
• 2004 · Vanity Fair as The Marquess of Steyne
• 2004 · Patrick as Patrick
• 2003 · Shade as Charlie Miller
• 2003 · Flight from Death: The Quest for Immortality as Narrator
• 2002 · Spider as Bill Cleg
• 2002 · Ghost Ship as Captain Sean Murphy
• 2002 · Horses: The Story of Equus as Narrator
• 2002 · Pursuing the Suspects as Himself
• 2002 · Keyser Soze, Lie or Legend - Featurette as Self
• 2000 · Madigan Men as Benjamin Madigan
• 2000 · Making Love as il violinista/Jeno Varga adulto
• 1999 · End of Days as The Man
• 1999 · Stigmata as Father Andrew Kiernan
• 1998 · Enemy of the State as 'Brill'
• 1998 · Quest for Camelot as Lionel (voice)
• 1998 · Pirates as Narrator (voice)
• 1998 · The Man in the Iron Mask as D'Artagnan
• 1997 · The End of Violence as Ray
• 1997 · The View as Self
• 1997 · Weapons of Mass Distraction as Lionel Powers
• 1997 · Smilla's Sense of Snow as The Mechanic
• 1996 · Somebody Is Waiting as Roger Ellis
• 1996 · The Brylcreem Boys as Commandant O'Brien
• 1995 · Dead Man as Charlie Dickinson
• 1995 · Frankie Starlight as Jack Kelly
• 1995 · Irish Cinema: Ourselves Alone? as Narrator
• 1995 · The Usual Suspects as Keaton
• 1994 · Little Women as Friedrich Bhaer
• 1994 · Trial by Jury as Daniel Graham
• 1994 · A Simple Twist of Fate as John Newland
• 1994 · All Things Bright and Beautiful as The Good Thief
• 1994 · Royal Deceit as Fenge
• 1993 · Late Night with Conan O'Brien as Self - Guest
• 1993 · A Dangerous Woman as Mackey
• 1993 · Point of No Return as Bob
• 1992 · Into the West as Papa Reilly
• 1992 · Cool World as Jack Deebs
• 1990 · Shipwrecked as Lt. John Merrick
• 1990 · Miller's Crossing as Tom Reagan
• 1988 · A Soldier's Tale as Saul
• 1988 · The Courier as Val
• 1987 · Hello Again as Kevin Scanlon
• 1987 · Lionheart as Black Prince
• 1986 · Gothic as Lord Byron
• 1986 · Defence of the Realm as Nicholas 'Nick' Mullen
• 1985 · Mussolini: The Untold Story as Vittorio Mussolini
• 1985 · Christopher Columbus as Christopher Columbus
• 1984 · Reflections as William Masters
• 1981 · The Search for Alexander the Great as Ptolemy
• Future · Nothing Is What It Seems: The Making Of 'The Usual Suspects' as self
• 1984 · The Treatment as Father Michael
• 1983 · The Keep as Major Kaempffer
• 1982 · The Rocking Horse Winner as Bassett
• 1981 · Excalibur as Uther
• 1978 · On a Paving Stone Mounted as
• 1978 · The Last of Summer as Bishop's secretary
• 1978 · Strangers as Johnny Maguire
• 1976 · Live from Lincoln Center as King Arthur
• 1975 · Saturday Night Live as Self - Host
• 1956 · Tony Awards as Self - Presenter
• Future · Sauver Mozart as