Filmography
| Year | Film | Role | Notes | |
|---|---|---|---|---|
| 1978 | The Riordans (TV series) | Pat Barry | ||
| Bracken (TV series) | Pat Barry | Jacob's Award for Best Actor in a Television Series in 1979. | ||
| 1981 | Love Is ... (TV play) | Larry | ||
| 1981 | Excalibur | Uther Pendragon | ||
| 1983 | Hanna K. | Joshua Herzog | ||
| The Keep | Major Kaempffer | |||
| 1984 | Reflections | William Masters | ||
| 1985 | Christopher Columbus | Christopher Columbus | ||
| 1985 | Defence of the Realm | Nicholas 'Nick' Mullen | ||
| 1986 | Gothic | Lord Byron | ||
| 1987 | Lionheart | The Black Prince | ||
| Hello Again | Dr. Kevin Scanlon | |||
| Julia and Julia | Paolo Vinci | |||
| Siesta | Augustine | Byrne met his future wife, Ellen Barkin, on the set of this movie. | ||
| The Courier | Val | |||
| 1988 | A Soldier's Tale | Saul | ||
| 1989 | Dark Obsession | Lord Hugo Bruckton | ||
| 1990 | Miller's Crossing | Tom Reagan | ||
| Shipwrecked | Lt. John Merrick | |||
| 1992 | Into the West | Papa Reilly | Also the associate producer | |
| Cool World | Jack Deebs | |||
| 1993 | Point of No Return | Bob | ||
| A Dangerous Woman | Colin Mackey | |||
| 1994 | A Simple Twist of Fate | John Newland | ||
| Trial by Jury | Daniel Graham | |||
| Little Women | Professor Friedrich Bhaer | |||
| Prince of Jutland | Fenge | |||
| 1995 | The Usual Suspects | Dean Keaton | ||
| Buffalo Girls | Teddy Blue | TV film | ||
| Dead Man | Charlie Dickinson | |||
| Frankie Starlight | Jack Kelly | |||
| 1996 | Draiocht | Father | TV film Byrne wrote this drama. |
|
| Mad Dog Time | Ben London | |||
| The Last of the High Kings | Jack Griffin | Also the writer and executive producer | ||
| Dr. Hagard's Disease | Also the executive producer | |||
| The Lark in the Clear Air | Executive producer, writer and director | |||
| Somebody is Waiting | Roger Ellis | Also the co-producer | ||
| 1997 | Smilla's Sense of Snow | The mechanic | ||
| The End of Violence | Ray Bering | |||
| Weapons of Mass Distraction | Lionel Powers | TV film | ||
| This is the Sea | Rohan | |||
| 1998 | Polish Wedding | Bolek | ||
| The Man in the Iron Mask | D'Artagnan | |||
| The Brylcreem Boys | Sean O'Brien | Also the co-producer | ||
| Quest for Camelot | Sir Lionel | (animated) (voice) | ||
| Enemy of the State | Fake Brill | |||
| 1999 | Stigmata | Father Andrew Kiernan | ||
| End of Days | The Man/Satan | |||
| 2000 | Madigan Men | Benjamin 'Ben' Madigan | (TV series) Also the co-executive producer |
|
| Canone inverso | Jeno Varga | |||
| 2002 | Virginia's Run | Ford Lofton | ||
| Spider | Bill Cleg | |||
| Emmett's Mark | Jack Marlow/Stephen Bracken | |||
| Ghost Ship | Captain Sean Murphy | |||
| 2003 | Shade | Charlie Miller | ||
| 2004 | Vanity Fair | The Marquess of Steyne | ||
| P.S. | Peter Harrington | |||
| The Bridge of San Luis Rey | Brother Juniper | |||
| 2005 | Assault on Precinct 13 | Captain Marcus Duvall | ||
| Wah-Wah | Harry Compton | |||
| 2006 | Played | Eddie | ||
| Jindabyne | Stewart Kane | |||
| Emotional Arithmetic | Christopher Lewis | |||
| 2008–2010 | In Treatment | Dr. Paul Weston | (TV series) Golden Globe Award win and Emmy Award nomination for Best Lead Actor in a Drama Series |
|
| 2009 | Butte, America | narrator | ||
| Perrier's Bounty | Voice of The Reaper | |||
| Leningrad | Phillip Parker | |||
| 2012 | Secret State (TV miniseries) | Tom Dawkins (Deputy Prime Minister) |
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