- Denys Hawthorne - Bishop Facks
- Declan Mulholland - Shouting Priest
- Clare Grogan - Niamh Connolly
- Richard Wilson - Richard Wilson
- Vernon Dobtcheff - Old Nazi
- Jeff Harding - Father Buzz Cagney
- Maggie Shevlin - Mrs. Collins
- Graham Norton - Father Noel Furlong
- Jim Norton - Bishop Len Brennan
- Don Wycherley - Father Cyril MacDuff
- Gemma Craven - Polly Clarke
- Tommy Duggan - Father Paul Cleary
- Arthur Mathews - Father Billy Kerrigan
- Mark O'Regan - Vatican Priest
- Gerard Murphy - Pilot
- Dermot Crowley - Father Liam Deliverance
- Peter Caffrey - Charles Hedges
- Ozzie Yue - Mr. Yin
- Brian Eno - Father Brian Eno
- Birdy Sweeney - Father Cullen
- Maria Doyle Kennedy - Patsy
- Eamon Morrissey - Father Beeching
- Pat Shortt - Tom
- Don Foley - Jim Halpin
- Zara Turner - Laura Sweeney
- Jean Ainslie - Jane
- Geoffrey Perkins - Voice of Spanish Interpreter
- Charlotte Bradley - Picnic Couple
- Jimmy Keogh - Father Fintan Fay
- Jon Kenny - Michael Cocheese
- Joe Rooney - Father Damien Lennon
- Jason Byrne - Referee
- Maurice O'Donoghue - Father Dick Byrne
- Mairead McKinley - Sister Monica
- Fergus O'Kelly - Father Barty Dunne
- Graham Linehan - Father Gallagher
- Noelle Brown - Teaching Nun
- Patrick Drury - John O'Leary
- Mark Murray - Surly Youth
- David Carey - Doctor
- Kate Binchy - Mrs. Stone
- James Berwick - Mr. Stone
- Joane Hall - Granny Stone
- Derrick Branche - Father Jose Fernandez
- Gerard Lee - Terry MacNamee
- Pat Leavy - Woman at Cinema
- Rosemary Henderson - Sister Assumpta
- Niall Buggy - Henry Sellers
- Chris Curran - Father Jim Johnson
- Shay Gorman - Father Jim Sutton
- Brendan Grace - Father Fintan Stack
- Fred Ridgeway - Father Ken Dillon
- Paddy Joyce - Shouting Priest
- Claire Cathcart - Sister Margaret
- Patrick McDonnell - Eoin McLove
- Elva Crowley - Mrs. Boyle
- Rosemary Kennedy - Mrs. Dunne
- Vincent Marzello - Television Psychiatrist
- Patrick Kavanagh - Father Seamus Fitzpatrick
- Eamon Rohan - Colm
- Des Keogh - Older Dublin Priest
- Simon Nelson - Younger Dublin Priest
- Tommy Tiernan - Father Kevin
- Neil Hannon - Father Ted Crilly (singing voice)
- Gail Fitzpatrick - Mrs. Millet
- Pat Laffan - Pat Mustard
- Stephen Brennan - Father Niall Haverty
- Charles Simon - Father Jim
- Conor Evans - Father Romeo Sensini
- Peter Dix - Craggy Island's Goalkeeper
- Miriam Kelly - Mrs. Doyle's Friend
- Liam O'Carroll - Priest with Sunglasses
- Jonathan White - Father Flynn
- Kevin Gildea - Father Cave
- John Olohan - Sergeant Hodgins
- Rio Fanning - Father Frost
- Tony Guilfoyle - Father Larry Duff
- Mal Whyte - Benson
- Rynagh O'Grady - Mary O'Leary
- Doreen Keogh - Mrs. Dineen
- Doreen Keogh - Mrs. Doyle's Friend
- Ann Rowan - Mrs. Glynn
- John Henderson - Tour Guide
- Geoffrey Perkins
- Graham Linehan
- Arthur Mathews
- Lissa Evans
Vernon Dobtcheff interpreta a Old Nazi en la serie.
Dermot Morgan interpreta a Father Ted Crilly en la serie.
Ardal O'Hanlon interpreta a Father Dougal McGuire en la serie.
Pauline McLynn interpreta a Mrs. Doyle en la serie.
Frank Kelly hace el papel de Father Jack Hackett.
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