Brendan's credits
Film
| Title | Role | Year | Director | Notes |
| The Raven | Reagan | 2012 | James McTeigue | |
| Perrier's Bounty | Jerome | 2009 | Ian Fitzgibbon | |
| Offside | Duncan Miller | 2009 | Marten Klingberg | |
| The Jacket | Damon | 2005 | John Maybury | |
| Allegiance | Michael Collins | 2005 | Brian Gilbert | *imdb |
| Map Maker | Robert Bates | 2001 | Johnny Gogan | |
| I Could Read the Sky | Francie | 1999 | Nicola Bruce | |
| Happy Birthday to Me | 1998 | Martin Moore | Cannes 98, Best Short Nominee | |
| The General | UVF Leader | 1998 | John Boorman | |
| Soft Sand, Blue Sea | Gerry | 1998 | Pip Broughton | |
| Tomorrow Never Dies | Leading Seaman | 1997 | Roger Spottiswoode | |
| The Cull | 1997 | Joe Ahearne | short film | |
| Last Bus Home | Steve Burkett | 1997 | Johnny Gogan | |
| Alice | Mr. Sinclair | 1997 | Michael Bray | short film |
| The Mark of Cain | Davy Gulliver | 1997 | Marc Munden | |
| Ailsa | Miles Butler | 1994 | Paddy Breathnach | |
| The Loser | Mike | 1990 | short film | |
| London Calling | 1990 | Peter Mulryan | short film |
Television
| Title | Role | Year | Notes |
| Starlings | Terry Starling | 2012 | |
| Downton Abbey | Jerome | 2010-11 | BAFTA nomination |
| Inspector George Gently | Patrick Donovan | 2009 | Ep: Gently in the night |
| Blue Murder | Derek Jowell | 2009 | Ep: Private Sins pt 1&2 |
| Lark Rise to Candleford | Robert Timmins | 2008-10 | |
| True Dare Kiss | Kaz Sweeney | 2007 | |
| Damage | Aidan Cahill | 2007 | TV movie |
| The Good Samaritan | Lewis Farrell | 2007 | TV movie |
| Wedding Belles | Father Henry | 2007 | TV movie |
| Perfect Parents | Ed | 2006 | TV movie |
| Soundproof | DI Dave Cox | 2006 | TV movie |
| The Commander:Blacklight | Carl Dirkwood | 2006 | TV movie |
| The Ghost Squad | Sgt. Ralph Allan | 2005 | Ep: Heroes |
| Jericho (of Scotland Yard) | Christie | 2005 | 3 eps: The Hollow Man; To Murder and Create; The Killing of Johnny Swan |
| Shameless | Father Polish | 2005 | Ep: 2.4 |
| North & South | Nicholas Higgins | 2004 | TV mini series |
| Omagh | DS John White | 2004 | TV movie |
| Amnesia | DC Ian Reid | 2004 | TV movie |
| Single | Paul | 2003 | |
| Waking the Dead | Martin Corgan | 2003 | 2 part ep: Multistorey |
| Rockface | Douglas McLanaghan | 2002-03 | |
| McCready & Daughter | Donal McCready | 2001 | |
| Conspiracy | SS Maj.Gen. Heinrich Müller | 2001 | TV movie |
| The Bombmaker | George McEvoy | 2001 | TV movie |
| The Inspector Lynley Mysteries | Richard Tey | 2001 | Ep: A Great Deliverance |
| Rebel Heart | Michael Collins | 2001 | TV mini series |
| Paths to Freedom | Jeremy Fitzgerald | 2000 | |
| McCready & Daughter | Donal McCready | 2000 | TV movie |
| Thief Takers | DI Bob "Bingo" Tate | 1996 | |
| Silent Witness | Liam Slattery | 1996 | 2 pt ep: Darkness Visible |
| Dangerfield | David Walsh | 1995 | 2pt ep: Victim of Rape |
| The Glass Virgin | Manuel Mendoza | 1995 | TV mini series |
| The Bill | Chris Bailey | 1992 | Ep: Radio waves |
| Fool's Gold | DS Benwell | 1992 | TV movie |
Theatre
| Title | Role | Director | Theatre |
| Chain Play II | Terry Starling | Various | The Almeida Theatre |
| The Late Henry Moss | Earl | Mike Attenborough | The Almeida Theatre |
| Buried Child | Tilden | Matthew Warchus | The National Theatre |
| The Bear | Smirnov | The Gate Theatre | |
| Dead Eye Boy | Billy | Jennie Darnell | Hampstead Theatre |
| Battle Royal | McMahon | Howard Davies | The National Theatre |
| The Changing Room | Kendal | James McDonald | Duke of York |
The Weir ** |
Brendan | Ian Rickson | Royal Court & Broadway |
| The Silver Tassie | Teddy Foran | Lynne Parker | The Almeida Theatre |
| The Plough & the Stars | Jack | Shivaun O'Casey | O'Casey Theatre |
| September Tide | Ewen | Mark Rayment | King's Head |
| Love Song for Ulster | Tricycle Theatre | ||
| Elegies to Angels, Punks & Raving Queens | King's Head | ||
| Philadelphia, Here I Come | Gar Private | Dan Crawford | King's Head & Wyndham |
| Pygmies in Ruins | Cllr. Brody | Eoin O'Callaghan | Royal Court |
| Ragged Trousered Philanthropist | Owen | Stephen Daldry | National Tour |
| Judgement Day | Travelling salesman | Stephen Daldry | Old Red Lion |
| All Souls Night | Michael Quinn | Roma Tomeltry | Lyric & Belfast Holloway |
| Playboy of the Western World | Christy | ? | ? |
| Rat in the Skull | ?? | ?? | ?? |
| Over the Bridge | ?? | ?? | ?? |
| Force & Hypocrisy | ?? | ?? | ?? |
**Laurence Olivier Award for Best Supporting Actor, 1999 and the Theatre World Award for Outstanding Broadway Debut, 1999
