The Irish Film and Television Award for Best Supporting Actor was an award bestowed by the Irish Film & Television Academy celebrating outstanding performances by actors in supporting roles in films and television dramas. It was a joint category until 2005, where actors were nominated from films and television dramas for the same award. The 3rd Irish Film & Television Awards introduced the current separate categories: Irish Film & Television Award for Best Actor in a Supporting Role - Film and Irish Film and Television Award for Best Actor in a Supporting Role - Television.
| Year | Winner | Film/Television Drama | Role |
|---|---|---|---|
| 2003 | David Wilmot[1] | Intermission | Oscar |
| Colin Farrell | Intermission | Lehiff | |
| Ciarán Hinds | Veronica Guerin | John Traynor | |
| Gerard McSorley | Veronica Guerin | John Gilligan | |
| Owen Roe | Any Time Now | Frank O'Halloran | |
| 2004 | Peter O'Toole[2] | Troy | Priam, King of Troy |
| Colum Convey | Holy Cross | Gerry McClure | |
| Gary Lydon | The Clinic | Mr. Patrick Murray | |
| Ciarán Nolan | Man About Dog | Scud Murphy | |
| Jim Norton | Proof | Ronan Corcoran |
| Year | Winner | Film | Role |
|---|---|---|---|
| 2005 | David Kelly[3] | Charlie and the Chocolate Factory | Grandpa Joe |
| Seán McGinley | On a Clear Day | Eddie | |
| Cillian Murphy | Batman Begins | Dr. Jonathan Crane / Scarecrow | |
| Tadgh Murphy | Boy Eats Girl | Diggs | |
| 2006 | Liam Cunningham[4] | The Wind That Shakes the Barley | Dan |
| Pádraic Delaney | The Wind That Shakes the Barley | Teddy O'Donovan | |
| Gerard McSorley | Middletown | Bill Hunter | |
| Stephen Rea | Breakfast on Pluto | Bertie Vaughan | |
| 2007 | Brendan Conroy[5] | Kings | Git |
| Donal O'Kelly | Kings | Jap Kavanagh | |
| Conor J. Ryan | Garage | David | |
| Don Wycherley | Speed Dating | Detective Noel Long | |
| 2008 | Liam Cunningham[6] | Hunger | Father Dominic Moran |
| Stuart Graham | Hunger | Raymond Lohan | |
| Gerard McSorley | Anton | Detective Lynch | |
| Peter O'Toole | Dean Spanley | Fisk Senior (Horatio) | |
| 2009 | Aidan Quinn[7] | The Eclipse | Nicholas Holden |
| Simon Delaney | Happy Ever Afters | Dessie | |
| Michael Fassbender | Fish Tank | Connor O'Reily | |
| Michael Gambon | Harry Potter and the Half-Blood Prince | Albus Dumbledore |
| Year | Winner | Film | Role |
|---|---|---|---|
| 2020 | Barry Ward[17] | Dating Amber | Ian Cotter |
| Brian Gleeson | Death of a Ladies' Man | Ben | |
| Colm Meaney | Pixie | Dermot O'Brien | |
| Conleth Hill | Herself | Aido | |
| Ned Dennehy | Undergods | Harry | |
| 2021 | Ciarán Hinds[18] | Belfast | Pop |
| Jamie Dornan | Belfast | Pa | |
| Cillian Ó'Gairbhí | Foscadh | Dave | |
| Dean Quinn | Who We Love | Simon | |
| Tom Vaughan-Lawlor | The Bright Side | Andy | |
| 2022[19] | Pierce Brosnan | Black Adam | Doctor Fate / Kent Nelson |
| Colin Farrell | The Batman | Oswald Cobblepot / The Penguin | |
| Brendan Gleeson | The Banshees of Inisherin | Colm Doherty | |
| Barry Keoghan | The Banshees of Inisherin | Dominic Kearney | |
| Paul Mescal | God's Creatures | Brian O'Hara | |
| Andrew Scott | Catherine Called Birdy | Lord Rollo | |
| 2023[20] | Paul Mescal | All of Us Strangers | Harry |
| Diarmuid Noyes | Double Blind | Ray | |
| Chris Walley | Lies We Tell | Edward | |
| Kenneth Branagh | Oppenheimer | Niels Bohr | |
| Liam Carney | Sunlight | Iver | |
| Lalor Roddy | That They May Face The Rising Sun | Patrick |
| Year | Winner | Television Drama | Role |
|---|---|---|---|
| 2005 | Garrett Lombard | Pure Mule | Scobie |
| Gary Lydon | The Clinic | Mr. Patrick Murray | |
| John Lynch | The Baby War | Pierce O'Carroll | |
| Chris O'Dowd | The Clinic | Brendan Davenport | |
| 2006 | Gary Lydon | The Clinic | Mr. Patrick Murray |
| Liam Cunningham | Murphy's Law | Drew Johnstone | |
| Allen Leech | Legend | Willy | |
| Chris O'Dowd | Showbands | Mervin Mooney | |
| 2007 | Nick Dunning | The Tudors | Thomas Boleyn, Earl of Wiltshire |
| Leroy Harris | Prosperity | Conroy | |
| Eamonn Hunt | The Running Mate | Paudie Counihan | |
| Gary Lydon | The Clinic | Mr. Patrick Murray | |
| 2008 | Peter O'Toole | The Tudors | Pope Paul III |
| Michael Fassbender | The Devil's Whore | Thomas Rainsborough | |
| David Herlihy | The Clinic | Nurse Liam Smith | |
| John Kavanagh | George Gently | Doyle | |
| 2009 | Stephen Rea | Father & Son | Augustine Flynn |
| Declan Conlon | Fair City | Turlough Norris | |
| Diarmuid Noyes | Pure Mule – The Last Weekend | Dean | |
| Owen Roe | Val Falvey, TD | Pat Daly |
| Year | Winner | Television Drama | Role |
|---|---|---|---|
| 2020 | Fionn O'Shea | Normal People | Jamie |
| Desmond Eastwood | Normal People | Niall | |
| Éanna Hardwicke | Smother | Joe Ryan | |
| Colm Meaney | Gangs of London | Finn Wallace | |
| Andrew Scott | His Dark Materials | Colonel John Parry | |
| 2021 | Ciarán Hinds | Kin | Eamon Cunningham |
| Peter Coonan | Hidden Assets | Fionn Brannigan | |
| Owen McDonnell | Three Families | Mark Ryan | |
| Emmett J. Scanlan | Kin | Jimmy Kinsella | |
| Andrew Scott | The Pursuit of Love | Lord Merlin | |
| 2022 | Moe Dunford | The Dry | Jack |
| Brian Gleeson | Bad Sisters | Tom Claffin | |
| Ciarán Hinds | The Dry | Tom Sheridan | |
| Daryl McCormack | Bad Sisters | Matt Claffin | |
| Michael Smiley | Bad Sisters | Roger Muldoon | |
| Tommy Tiernan | Conversations with Friends | Dennis Flynn | |
| 2023 | Richard Dormer | Blue Lights | Gerry Cliff |
| Jared Harris | Foundation | Hari Seldon | |
| Aaron Monaghan | Hidden Assets | Sean Prender | |
| Aidan Gillen | Kin | Frank Kinsella | |
| Emmett J. Scanlan | Jimmy Kinsella | ||
| Simon Delaney | The Woman in the Wall | Massey |