
| Dominic Mafham | ... | Dan Woodhouse / ... (55 episodes, 2003-2008) |
 | Gary Lydon | ... | Patrick Murray (48 episodes, 2003-2008) |
 | Amy Huberman | ... | Daisy O'Callaghan (48 episodes, 2003-2008) |
 | Aisling O'Sullivan | ... | Dr. Cathy Costello (47 episodes, 2003-2008) |
 | Gertrude Montgomery | ... | Aine Flanagan (45 episodes, 2003-2007) |
 | Rachael Pilkington | ... | Keelin Geraghty / ... (44 episodes, 2003-2008) |
 | Leigh Arnold | ... | Dr. Clodagh Delaney (32 episodes, 2005-2008) |

| Norma Sheahan | ... | Fiona McColgan (28 episodes, 2003-2008) |
 | Geraldine Plunkett | ... | Mrs. Fleming (26 episodes, 2003-2005) |

| Sam Corry | ... | Alex / ... (26 episodes, 2003-2005) |
 | Gemma Craven | ... | Dr. Julia Brady (22 episodes, 2006-2008) |
 | Dawn Bradfield | ... | Cara Madigan (22 episodes, 2006-2008) |
 | David Herlihy | ... | Liam Smith (21 episodes, 2006-2008) |

| Mark Dymond | ... | Dr. Lorcan O'Brien / ... (19 episodes, 2007-2008) |

| Chris O'Dowd | ... | Brendan Davenport (18 episodes, 2003-2005) |
 | David Wilmot | ... | Dr. Ed Costello (16 episodes, 2003-2004) |

| Tomas O'Suilleabhain | ... | Detective Ronan Donaghue (16 episodes, 2005-2008) |
 | Simon O'Gorman | ... | Billy Flanagan (13 episodes, 2003-2007) |

| Orla O'Rourke | ... | Sinéad Kelly / ... (13 episodes, 2004-2006) |
 | Aidan Turner | ... | Ruairi McGowan / ... (10 episodes, 2008) |

| Marian Araujo | ... | Marta Lopez (10 episodes, 2005) |
 | Vincent Patrick | ... | Jack Laverty (9 episodes, 2006) |

| Niall Toibin | ... | Dr. Paul O'Callaghan (9 episodes, 2003-2005) |
 | Colin O'Donoghue | ... | Conor / ... (9 episodes, 2006-2008) |
 | Lorraine Pilkington | ... | Susie Cassidy (8 episodes, 2003) |

| Stuart Graham | ... | Dr. Richard McKenna (8 episodes, 2005) |
 | Isobel Mahon | ... | Bernie (8 episodes, 2006-2008) |

| Lesley Conroy | ... | Kathleen / ... (7 episodes, 2003-2007) |

| Mark Huberman | ... | Kieran Miller (7 episodes, 2005-2008) |
 | Matthew Keenan | ... | Sam Connolly (7 episodes, 2005) |
 | Catherine Walker | ... | Alice O'Brien (6 episodes, 2007-2008) |
 | Garrett Keogh | ... | Martin Geraghty / ... (6 episodes, 2003-2006) |
 | Eva Bartley | ... | Polly (6 episodes, 2003) |
 | Sean Flanagan | ... | Sean Connell (6 episodes, 2003) |

| Rory Keenan | ... | Michael (6 episodes, 2003) |
 | Ruth McCabe | ... | Maria Geraghty (6 episodes, 2003) |
 | Tatiana Ouliankina | ... | Natalia Riabushkin (6 episodes, 2003) |
 | Keith Duffy | ... | Paul Dunne (6 episodes, 2004-2007) |
 | Gabrielle Reidy | ... | Meg Duffy (6 episodes, 2005) |
 | Keith McErlean | ... | Dr. Adam (6 episodes, 2007) |
 | Barbara Adair | ... | Mrs. Stapleton / ... (5 episodes, 2003-2005) |
 | Ian McElhinney | ... | Joseph McGarry (5 episodes, 2003) |

| Olga Wehrly | ... | Molly Miller (5 episodes, 2005-2007) |
 | Jonathan Byrne | ... | Will Cafferty (5 episodes, 2005) |
 | Liam Cunningham | ... | Malcolm Keown (5 episodes, 2005) |
 | Cian McCormack | ... | Emmet Keown (5 episodes, 2005) |
 | Ryan Andrews | ... | Ian Smith (5 episodes, 2007-2008) |

| Laura Way | ... | Emer Ryan (5 episodes, 2007) |
 | Saoirse Ronan | ... | Rhiannon Geraghty (4 episodes, 2003-2004) |
 | Jake Williams | ... | Barry Geraghty (4 episodes, 2003-2004) |
 | Chris Newman | ... | Tommy Geraghty (4 episodes, 2003) |
 | Jane McGrath | ... | Gillian Ryan (4 episodes, 2005-2006) |
 | Tina Kellegher | ... | Jean Keown (4 episodes, 2005) |
 | Leanna Duke | ... | Aoife Smith (4 episodes, 2007-2008) |
 | Darren Healy | ... | Richie Sweeney / ... (3 episodes, 2003-2007) |
 | Ruth Bradley | ... | Moya Cassidy (3 episodes, 2003) |
 | Neilí Conroy | ... | Sorcha Geraghty (3 episodes, 2003) |
 | Britta Smith | ... | Deborah Clarke O'Driscoll / ... (3 episodes, 2004-2006) |
 | Jeananne Crowley | ... | Virginia Delaney (3 episodes, 2004-2005) |
 | Denis Conway | ... | Liam Quinn (3 episodes, 2004) |
 | Luke Griffin | ... | Niall Gallagher (3 episodes, 2004) |
 | Aidan Kelly | ... | Dermot Fleming (3 episodes, 2004) |
 | Deirdre O'Kane | ... | Rosie Quinn (3 episodes, 2004) |
 | Anne Byrne | ... | Nora Ryan (3 episodes, 2005) |
 | Deirdre Donnelly | ... | Carol O'Dwyer (3 episodes, 2006-2007) |
 | Darragh Kelly | ... | Niall Boylan (3 episodes, 2007-2008) |
 | Hilary Reynolds | ... | Aideen Boylan (3 episodes, 2007-2008) |
 | Siobhan Cullen | ... | Kristen (3 episodes, 2007) |
 | Eleanor Methven | ... | Dervla Rogers (3 episodes, 2007) |
 | Tanya Moodie | ... | Grace Safete (2 episodes, 2008) |
 | Barry Cassin | ... | Spike Molloy (2 episodes, 2003-2007) |
 | Olivia Shanley | ... | Enid / ... (2 episodes, 2003-2007) |
 | Brian Doherty | ... | Trevor / ... (2 episodes, 2003-2004) |
 | Alexander Downes | ... | David Penrose / ... (2 episodes, 2003-2004) |
 | Enda Kilroy | ... | Disgruntled Man / ... (2 episodes, 2003-2004) |
 | Liam Carney | ... | Mr. Callan (2 episodes, 2003) |
 | Emma Colohan | ... | Allanah Geraghty (2 episodes, 2003) |
 | Janet Moran | ... | Molly (2 episodes, 2003) |
 | Noelle Brown | ... | Cathleen Buckley / ... (2 episodes, 2004-2008) |
 | Sarah Bolger | ... | Janey Quinn / ... (2 episodes, 2004) |
 | Jane Brennan | ... | Maeve's Mother (2 episodes, 2004) |
 | Anna Manahan | ... | Brendan's Nan (2 episodes, 2004) |
 | Jane Valentine | ... | Maeve Dolan (2 episodes, 2004) |

| Charlie Kranz | ... | Dominick Shaw / ... (2 episodes, 2005-2009) |

| John Burke | ... | Liam's patient / ... (2 episodes, 2005-2008) |
 | Dorothy Cotter | ... | Orla McGuigan / ... (2 episodes, 2005-2008) |
 | Fionnuala Murphy | ... | Irate Female Patient / ... (2 episodes, 2005-2007) |
 | Pat Laffan | ... | James O'Driscoll (2 episodes, 2005-2006) |
 | Charlotte Bradley | ... | Sonia Harper (2 episodes, 2005) |
 | Philip Judge | ... | Eugene (2 episodes, 2005) |
 | Andrew Keane | ... | Brian Noonan (2 episodes, 2005) |
 | Laine Megaw | ... | Annie McKenna (2 episodes, 2005) |
 | Gary Murphy | ... | Dr. Denny (2 episodes, 2005) |
 | Ann O'Neill | ... | Dee Noonan (2 episodes, 2005) |
 | Veronica O'Reilly | ... | Veronica (2 episodes, 2005) |
 | Karl Argue | ... | Karl the Courier (2 episodes, 2006) |
 | Melanie Clark Pullen | ... | Ann Marie (2 episodes, 2006) |
 | James Mulkerrins | ... | A&E Nurse #2 / ... (2 episodes, 2007-2008) |
 | Cara O'Sullivan | ... | Lorna Boylan (2 episodes, 2007-2008) |
 | Stephen Brennan | ... | Dr. Harry Donovan / ... (2 episodes, 2007) |
 | Mairead Devlin | ... | A&E Doctor / ... (2 episodes, 2007) |
 | Michelle Donnelly | ... | Mary Cooke (2 episodes, 2007) |
 | Simon Keogh | ... | Max (2 episodes, 2007) |
 | Miriam McKenna | ... | A&E Nurse #1 (2 episodes, 2007) |

| Clodagh Reid | ... | Rachel (2 episodes, 2007) |
 | Steve Blount | ... | Stephen Roe (2 episodes, 2008) |
|
| Max Aifa | .... | dressing props (15 episodes, 2005-2008) |
| James Dunleavy | .... | stand-by painter (15 episodes, 2005-2008) |
| Michael Flood | .... | property master (15 episodes, 2005-2008) |
| Tom Lundy | .... | master painter (15 episodes, 2005-2008) |
| Ed Norton | .... | construction manager (15 episodes, 2005-2008) |
| Liam O'Riain | .... | master carpenter (15 episodes, 2005-2008) |
| John Porter | .... | dressing props (15 episodes, 2005-2008) |
| Sheelagh Power | .... | buyer (15 episodes, 2005-2008) |
| Simon Boyd | .... | stand-by props (14 episodes, 2005-2008) |
| Owen Monaghan | .... | stand-by props (12 episodes, 2005-2007) |
| Alex Bassett | .... | stand-by carpenter (10 episodes, 2007-2008) |
| Rory Bruen | .... | stand-by art director (10 episodes, 2007-2008) |
| Frank Burke | .... | stand-by rigger (10 episodes, 2007-2008) |
| Veronica Smart | .... | art department assistant (10 episodes, 2007-2008) |
| Ciaran Doyle | .... | props (10 episodes, 2008) |
| Anthony Arkins | .... | stagehand / stand-by stagehand (9 episodes, 2005-2007) |
| Gillian Ni Chaiside | .... | stand-by art director / art department trainee (5 episodes, 2004-2005) |
| John Arkins | .... | stand-by stagehand (4 episodes, 2007) |
| David Chambers | .... | stand-by stagehand (3 episodes, 2004-2005) |
| Pascal Farrell | .... | stand-by carpenter (3 episodes, 2005) |
| Eddie Arkins | .... | stagehand (3 episodes, 2008) |
| Simon Dalton | .... | stand-by props (3 episodes, 2008) |
| Lesley Kearns | .... | stand-by stagehand (3 episodes, 2008) |
| Matthew Kirwan | .... | stand-by carpenter (2 episodes, 2005) |
| Paul Arkins | .... | stand-by stagehand (2 episodes, 2007) |
|
| Ken Carlisle | .... | stand-by carpenter (unknown episodes, 2004) |
| Michael Freeney | .... | stand-by rigger (unknown episodes, 2004) |
| John Dambrauskas | .... | greens coordinator (unknown episodes) |
| Vivienne Gray | .... | assistant art director (unknown episodes) |
| Kevin Kileen | .... | stand-by rigger (unknown episodes) |
| Ciara O'Donnell | .... | stand-by art director (unknown episodes) |
| Gearóid O'Riain | .... | stand-by stagehand (unknown episodes) |
| Sean Scott | .... | master painter (unknown episodes) |
| Matthew Thomson | .... | stand-by carpenter (unknown episodes) |
| |
|
| Laerke Sigfred Pedersen | .... | script supervisor (28 episodes, 2003-2008) |
| Barry Newman | .... | location assistant (20 episodes, 2006-2007) |
| Dr. John Bourke | .... | health professional advisor / medical advisor (15 episodes, 2004-2008) |
| Ruth Hunter | .... | business and legal affairs (15 episodes, 2005-2008) |
| Glen Dolman | .... | head script editor / script editor (14 episodes, 2006-2007) |
| Niall Delaney | .... | production accountant (12 episodes, 2005-2007) |
| Emer Fitzpatrick | .... | assistant accountant (12 episodes, 2005-2007) |
| Karen Fitzpatrick | .... | publicist: RTE / unit publicist (11 episodes, 2005-2007) |
| Kieran Grimes | .... | script researcher (10 episodes, 2007-2008) |
| Ciaran Hayden | .... | assistant script editor (10 episodes, 2007-2008) |
| Johanna Hogan | .... | business and legal affairs (10 episodes, 2007-2008) |
| Labros Chatzis | .... | medical advisor / health professional advisor (9 episodes, 2005-2007) |
| Dermot Cleary | .... | location manager (8 episodes, 2006-2007) |
| Steven Davenport | .... | assistant location manager (8 episodes, 2006-2007) |
| Gerry Rafferty | .... | health professional advisor (7 episodes, 2007-2008) |
| Aoife Cassidy | .... | production coordinator (7 episodes, 2007) |
| Junior Farrell | .... | facilities manager (7 episodes, 2007) |
| Vicki Madden | .... | script editor: series (7 episodes, 2007) |
| Michelle McCartan | .... | unit nurse (7 episodes, 2007) |
| Anna Merritt | .... | script editor (7 episodes, 2007) |
| Una Spillane | .... | assistant production coordinator (7 episodes, 2007) |
| Catherine Bolger | .... | health professional advisor / medical advisor (5 episodes, 2004-2005) |
| Orlaith Deasy | .... | assistant production coordinator (5 episodes, 2004-2005) |
| Suzanne Lawler | .... | health professional advisor / medical advisor (5 episodes, 2004-2005) |
| Catherine Morris | .... | script supervisor (5 episodes, 2005-2007) |
| Claire Bennett | .... | script editor (5 episodes, 2005) |
| Grant Bobbett | .... | assistant location manager (5 episodes, 2005) |
| Jo Calam | .... | drama development manager: RTE (5 episodes, 2005) |
| Ruth Carter | .... | assistant script editor (5 episodes, 2005) |
| Gavin Casey | .... | title sequence (5 episodes, 2005) |
| Cliodhna Colgan | .... | production coordinator (5 episodes, 2005) |
| Dee Collier | .... | researcher (5 episodes, 2005) |
| Peter Conway | .... | location manager (5 episodes, 2005) |
| Dr. John Fleetwood | .... | medical advisor (5 episodes, 2005) |
| Niav Garavan | .... | medical advisor (5 episodes, 2005) |
| Michael Hyland | .... | business & finance manager: RTE (5 episodes, 2005) |
| Denise Lynch | .... | medical advisor (5 episodes, 2005) |
| Dr. Simon Mills | .... | medical advisor (5 episodes, 2005) |
| Conor Sweeney | .... | business and legal affairs (5 episodes, 2005) |
| James Hickey | .... | business and legal affairs (4 episodes, 2005) |
| Dearbhla Keating | .... | publicist: RTE (3 episodes, 2005) |
| Michael Mahony | .... | health professional advisor (3 episodes, 2007-2008) |
| Seamus O'Reilly | .... | health professional advisor (3 episodes, 2007) |
| Juliet Bressan | .... | health professional advisor (3 episodes, 2008) |
| Susan Chandler | .... | assistant production coordinator (3 episodes, 2008) |
| Orla Collins | .... | assistant accountant (3 episodes, 2008) |
| Katie Davies | .... | assistant script editor (3 episodes, 2008) |
| Gillian Flood | .... | production coordinator (3 episodes, 2008) |
| Eoin Holohan | .... | location manager (3 episodes, 2008) |
| Myra Irvine | .... | unit nurse (3 episodes, 2008) |
| Karen McSwiney | .... | production accountant (3 episodes, 2008) |
| Evelyn O'Neill | .... | assistant location manager (3 episodes, 2008) |
| Clarke Tracey | .... | facilities manager (3 episodes, 2008) |
| Dr. Shane Murnaghan | .... | medical advisor (2 episodes, 2005) |
| Derek Freedman | .... | health professional advisor (2 episodes, 2007-2008) |
| Donall King | .... | health professional advisor (2 episodes, 2007-2008) |
| Catherine Cradock | .... | health professional advisor (2 episodes, 2007) |
| Louise Cullen | .... | animal handler (2 episodes, 2007) |
| Maria Soskova-Campion | .... | health professional advisor (2 episodes, 2007) |
| Tarek Zurob | .... | health professional advisor (2 episodes, 2007) |
| George Karr | .... | health professional advisor (2 episodes, 2008) |
| Sonia Kelly | .... | health professional advisor (2 episodes, 2008) |
|
| Dr. Vincent Carroll | .... | health professional advisor (unknown episodes, 2004) |
| Niki Heatley | .... | assistant script editor (unknown episodes, 2004) |
| Joan Lambe | .... | assistant production accountant (unknown episodes, 2004) |
| Simon Wheeler | .... | script editor (unknown episodes, 2004) |
| Sharon Brady | .... | unit publicist (unknown episodes) |
| Miriam Coleman | .... | assistant location manager (unknown episodes) |
| Emma Jane Dunne | .... | assistant script editor (unknown episodes) |
| Dr. Emer Keating | .... | health professional advisor (unknown episodes) |
| Lisa Kelly | .... | extras coordinator (unknown episodes) |
| Gerald Kenny | .... | health professional advisor (unknown episodes) |
| Ceri Meyrick | .... | script editor (unknown episodes) |
| Lisa Murphy | .... | assistant production coordinator (unknown episodes) |
| Siobhan Murphy | .... | health professional advisor (unknown episodes) |
| Michael O'Connell | .... | production department trainee (unknown episodes) |
| Maria O'Connor | .... | location manager (unknown episodes) |
| Brendan O'Sullivan | .... | location department trainee (unknown episodes) |
| Mary Perry | .... | health professional advisor (unknown episodes) |
| Sophie Tebbit | .... | assistant accountant (unknown episodes) |
| |