| Cate Blanchett | ... Veronica Guerin |
|
| Gerard McSorley | ... John Gilligan |
| Ciarán Hinds | ... John Traynor |
|
| and |
| Brenda Fricker | ... Bernie Guerin |
|
| Don Wycherley | ... Chris Mulligan |
| Barry Barnes | ... Graham Turley |
| Simon O'Driscoll | ... Cathal Turley |
| Emmet Bergin | ... Aengus Fanning |
| Charlotte Bradley | ... Ann Harris |
| Mark Lambert | ... Willy Kealy |
| Garrett Keogh | ... Tony Gregory |
| Maria McDermottroe | ... Geraldine Gilligan |
| Paudge Behan | ... Brian Meehan |
| Joe Hanley | ... Eugene "Dutchie" Holland |
| David Murray | ... Charles Bowden |
| Karl Shiels | ... Gilligan Gang Member No. 1 |
| Barry McEvoy | ... Gilligan Gang Member No. 2 |
| Gina Costigan | ... Traynor's Girlfriend |
| Alan Devine | ... Gerry Hutch |
| Gerry O'Brien | ... Martin Cahill |
| Gabrielle Reidy | ... Frances Cahill |
| Paul Roe | ... Tommy Mullen |
| David Herlihy | ... Peter (Fatso) Mitchell |
| Darragh Kelly | ... Terry Fagan |
| Colin Farrell | ... Tattooed Boy |
| Laurence Kinlan | ... Timmy (14 Year Old Junkie) |
| Danielle Fox-Clarke | ... Girl Junkie |
| Sarah O'Reilly-Maloney | ... Girl Junkie No. 2 |
| Paul Ronan | ... Jimmy Guerin |
| Philip O'Sullivan | ... Solicitor |
| Niall Toibin | ... Judge Ballaugh |
| Kevin McHugh | ... Judge at Assault Trial |
| Joe Taylor | ... Priest (Bernadette's Church) |
| Vincent McCabe | ... Priest at Funeral |
| Des Cave | ... Police Spokesman |
| Luke Hayden | ... Protection Garda No. 1 |
| Joe Gallagher | ... Protection Garda No. 2 |
| Ned Dennehy | ... Jamey the Tout |
| Tommy O'Neill | ... Cahill Thug No. 1 |
| Shane McCabe | ... Cahill Thug No. 2 |
| Brian McGuinness | ... Cahill Thug No. 3 |
| Sally Ann Doddy | ... Mrs. Hutch |
| Aaron Harris | ... Press Conference Reporter No. 1 |
| Jonathan White | ... Press Conference Reporter No. 2 |
| Maggie Wade | ... Coleen the Parole Clerk |
| Ann Cassin | ... Woman Newscaster |
| Elizabeth Moynihan | ... Woman Newscaster No. 2 |
| Jimmy Greeley | ... Newscaster No. 1 |
| Brian Dobson | ... Newscaster No. 2 |
| Kevin Reynolds | ... Studio Interviewer No. 1 |
| Gerry Ryan | ... Studio Interviewer No. 2 |
| Barbara Brennan | ... Jealous Journalist No. 1 |
| Gary Lilburn | ... Jealous Journalist No. 2 |
| Jane Brennan | ... Jealous Journalist No. 3 |
| Frank Smith | ... Jealous Journalist No. 4 |
| Malachy McKenna | ... Male Officer No. 1 |
| Kieran Hurley | ... Male Officer No. 2 |
| Terry Byrne | ... Man in Registry Office |
| Mick Nolan | ... Tax Assessor |
| Barbara Ryan | ... Aengus' Secretary |
| Enda Oates | ... Warehouse Worker No. 1 |
| Martin Dunne | ... Warehouse Worker No. 2 |
| Helen Norton | ... Witness Nurse No. 1 |
| Noelle Brown | ... Witness Nurse No. 2 |
| Veronica Duffy | ... ICU Attendant |
| Brian Munn | ... Elegant Equestrian |
| Cathy White | ... Elegant Equestrian Woman |
| Amy Shiels | ... Gilligan's Mistress |
| Fiona Glascott | ... Meehan's Girlfriend |
| Shelly Smith | ... Gang Girlfriend No. 1 |
| Grainne Debuitlear | ... Gang Girlfriend No. 2 |
| Emily Kelly | ... Gang Girlfriend No. 3 |
| Vanessa Keogh | ... Hooker No. 1 |
