Credits

• 2026 · Remarkably Bright Creatures as
• 2025 · Bring Them Down as Ray
• 2025 · Safe Harbor as Kieran Walsh
• 2024 · Duchess as Frank Monaghan
• 2024 · The Ballad of Davy Crockett as Caleb
• 2024 · No Way Up as Brandon
• 2023 · In the Land of Saints and Sinners as Robert McQue
• 2023 · Marlowe as Bernie Ohls
• 2023 · Unwelcome as Colm “Daddy” Whelan
• 2022 · The Serpent Queen as Francis I of France
• 2021 · The Monkey as MacDonell
• 2021 · Back to Barrytown as Self / Narrator
• 2020 · The Singapore Grip as Major Brendan Archer
• 2020 · Gangs of London as Finn Wallace
• 2020 · The Banker as Patrick Barker
• 2019 · Seberg as Frank Ellroy
• 2019 · Tolkien as Father Francis Morgan
• 2017 · Will as James Burbage
• 2017 · Halal Daddy as Martin Logan
• 2016 · Pelé: Birth of a Legend as George Raynor
• 2016 · Pelé: Birth of a Legend as Coach George Raynor
• 2016 · The Cowboy as Self
• 2016 · Norm of the North as Grandfather (voice)
• 2015 · Childhood's End as Wainwright
• 2014 · The Driver as The Horse
• 2013 · Free Birds as Myles Standish (voice)
• 2013 · One Chance as Roland Potts
• 2012 · The Cold Light of Day as Bandler
• 2012 · Bel Ami as Monsieur Rousset
• 2011 · Hell on Wheels as Thomas 'Doc' Durant
• 2011 · The Conspirator as David Hunter
• 2010 · Get Him to the Greek as Jonathan Snow
• 2009 · Alice as King of Hearts
• 2009 · The Race as Frank Kensay
• 2009 · Law Abiding Citizen as Detective Dunnigan
• 2009 · Mercy as
• 2009 · The Damned United as Don Revie
• 2009 · ZOS: Zone of Separation as George Titac
• 2006 · Men in Trees as Bob O'Donnell
• 2006 · Covert One: The Hades Factor as Peter Howell
• 2006 · The Unit as
• 2005 · It's Always Sunny in Philadelphia as Shelley Kelly
• 2004 · Layer Cake as Gene
• 2004 · Stargate Atlantis as Cowen
• 2004 · The Murdoch Mysteries as Inspector Brackenreid
• 2004 · Bad Apple as Gibbons
• 2004 · Renegade as Jimmy McClure
• 2001 · Law & Order: Criminal Intent as Harold Garrett
• 1999 · The Magical Legend of the Leprechauns as Seamus Muldoon
• 1999 · Mystery, Alaska as Mayor Scott Pitcher
• 1998 · Owd Bob as Keith Moore
• 1997 · Con Air as Agent Duncan Malloy
• 1995 · The Englishman Who Went Up a Hill But Came Down a Mountain as Morgan the Goat
• 1994 · Scarlett as Father Colum O'Hara
• 1994 · The Road to Wellville as Dr. Lionel Badger
• 1994 · Gargoyles as Mr. Dugan (voice)
• 1993 · The Snapper as Dessie Curley
• 1993 · Star Trek: Deep Space Nine as Miles O'Brien
• 1993 · Dr. Quinn, Medicine Woman as Jake Slicker
• 1992 · Under Siege as Daumer
• 1992 · The Last of the Mohicans as Major Ambrose
• 1992 · Far and Away as Kelly
• 1991 · Brooklyn Bridge as
• 1991 · The Commitments as Jimmy Rabbitte, Sr.
• 1990 · Law & Order as Wyatt Landon
• 1990 · Die Hard 2 as Windsor Plane - Pilot
• 1990 · Dick Tracy as Cop at Tess'
• 1989 · The Simpsons as Tom O'Flanagan (voice)
• 1987 · Star Trek: The Next Generation as Miles O'Brien
• 1987 · The Dead as Mr. Bergin
• 1985 · MacGyver as Irwin Malcolm
• 1985 · Moonlighting as Keterina Suitor (as Colm Meany)
• 1984 · Tales from the Darkside as Constable
• 1982 · Easter 2016 as Kevin Murphy
• 1962 · The Late Late Show as Self
• Future · The Panic as J. Pierpont Morgan
• 2024 · The Problem with People as Ciáran
• 2023 · The Santa Stories as The No Man/ Bill
• 2022 · Save the Cinema as Martyn
• 2021 · Fúria as
• 2020 · Pixie as Dermot O'Brien
• 2018 · What We Left Behind: Looking Back at Star Trek: Deep Space Nine as Self
• 2017 · The Journey as Martin McGuinness
• 2014 · The Devil's Hand as Elder Beacon
• 2013 · Alan Partridge: Alpha Papa as Patt Farrell
• 2013 · Star Trek: The Next Generation - The Best of Both Worlds as Chief Miles O'Brien (archive footage)
• 2012 · Soldiers of Fortune as Mason
• 2011 · Whole Lotta Sole as Detective Weller
• 2011 · The Hot Potato as Harry
• 2010 · Parked as Fred Daly
• 2008 · Three and Out as Tommy Cassidy
• 2006 · Five Fingers as Gavin
• 2005 · Turning Green as Tom
• 2004 · Battle of the Brave as Benjamin Franklin
• 2003 · The Boys & Girl from County Clare as Jimmy
• 2003 · Intermission as Jerry Lynch
• 2002 · King of Texas as Mr. Tumlinson
• 2002 · How Harry Became a Tree as Harry
• 2002 · Random Passage as
• 2002 · Backflash as Gin O'Malley
• 1999 · Four Days as Fury
• 1998 · Money Kings as Al Sheehan
• 1998 · Claire Dolan as Roland Cain
• 1998 · October 22 as Steve
• 1998 · Monument Ave. as Jackie O'Hara
• 1996 · The Last of the High Kings as Jim Davern
• 1996 · The Van as Larry
• 1996 · The Making of Star Trek Deep Space Nine Trials And Tribble-ations as Self
• 1996 · Star Trek: 30 Years and Beyond as Self
• 1994 · War of the Buttons as Geronimo's Dad
• 1992 · Into the West as Barreller
• 1990 · Come See the Paradise as Gerry McGurn
• 1987 · The Gambler: The Legend Continues as Tinkerer
• Future · Shelter Me as
• 2025 · Re-Creation as Ian Bailey
• 2025 · The Legend of the Happy Worker as
• 2023 · Scary Tales of New York as Storyteller
• 2023 · There's Always Hope as Jonathan
• 2022 · Three Day Millionaire as Mr. Barr
• 2022 · Confession as Father Peter
• 2019 · The Last Right as Detective Donall Crowley
• 2018 · National Theatre Live: Cat on a Hot Tin Roof as Big Daddy
• 2016 · The Secrets of Emily Blair as Father Avital
• 2015 · I Am Your Father as Narrator (voice)
• 2015 · A Dangerous Arrangement as Leslie
• 2014 · Star Trek: The Next Generation - All Good Things... as Miles O'Brien
• 2014 · The Yank as Fintan McGuire
• 2013 · A Belfast Story as Detective
• 2011 · Muide Éire as Himself
• 2011 · The Perfect Stranger as Mark O'Reilly
• 2011 · The Flight of the Swan as Giannopoulos
• 2010 · Alleged as H.L. Mencken
• 2008 · Unnatural Causes as Trevor Jones
• 2007 · Kings as Joe Mullan
• 2006 · Caved In as Vincent
• 2006 · A Lobster Tale as Cody
• 2004 · The Murdoch Mysteries: Poor Tom Is Cold as Inspector Brackenreid
• 2004 · The Murdoch Mysteries: Except the Dying as Inspector Brackenreid
• 2003 · Deep Space Nine: Ending an Era as Self
• 2002 · Random Passage as Thomas Hutchings
• 1999 · Chapter Zero as Frank Lazaras
• 1999 · This Is My Father as Seamus
• 1995 · Star Trek: Deep Space Nine - The Way of the Warrior as Miles O'Brien
• 1995 · The New Explorers: The Science of Star Trek as Self
• 1994 · Journey's End - The Saga of Star Trek: The Next Generation as Self
• 1993 · Star Trek: Deep Space Nine - Behind the Scenes as Himself
• 1989 · Perfect Witness as Meagher
• 1986 · Omega Syndrome as Sean
• 1981 · Nailed as Younger Protestant
• Future · The Last Days of Rabbit Hayes as Jack