- Flora Montgomery - McCallister
- Asan N'Jie - Larry
- Brenda McNeill - Bomb disposal officer
- Nigel Mercier - HMSU Commander
- Kathy Kiera Clarke - Clare Keenan
- Caolan Byrne - Ben McFarland
- Emer Casey - Sandwich Shop Owner
- Roy Heaybeard - Farmer
- Sean Sloan - Pat's Solicitor
- Ian McElhinney - Adam Corry
- Peter Ballance - Pat Keenan
- Michael Smiley - Dinger
- Stella McCusker - Valerie
- Cara Kelly - Siobhan Harkin
- Valerie Lilley - Linda Corry
- Sara Dylan - Beaten Woman
- Susan Lynch - Heather Pentland
- Jonny Everett - Detective
- Sean McNamee - Intelligence Officer
- Diarmaid Murtagh - Robert Dardis
- Don Wycherley - AJ Boyd
- Vanessa Ifediora - Judith Kenny
- Vanessa Emme - Leah Hardy
- Brian Robinson - Constable Tiny
- Brian Devlin - Mr. Ford
- Elly Condron - Sandra Dardis
- Jesse Frazer - James Dardis
- Paul Garrett - Taxi Driver
- Chris McCurry - Davy
- Emma Little - Estate Agent
- Patrick Buchanan - HMSU Commander
- Lucy McConnell - Female Protection Officer
- Jane Brennan - Lauren Fitzpatrick
- Dan Gordon - Noel Timoney
- Amy Molloy - Louise Foyle
- Shaun Blaney - Stephen Foyle
- Colin Carnegie - Priest
- Geraldine McAlinden - Counsellor
- Richard Croxford - Yacht Club Secretary
- Nigel O'Neill - Chief Superintendent
- Rachel Handshaw - Agent Paula Halcrow
- Jonjo O'Neill - Ryan Savage
- Siobhan Kelly - Car Hire Agent
- Matthew Sharpe - PC Scott
- Naseen Morgan - Sadie
- Ruth Barrett
James Nesbitt interpreta a DCI Tom Brannick en la serie.
Lorcan Cranitch hace el papel de DCS Jackie Twomey.
Charlene McKenna hace el papel de DS Niamh McGovern.
Lola Petticrew interpreta a Izzy Brannick en la serie.
Chris Walley interpreta a DC William 'Birdy' Bird en la serie.
Victoria Smurfit interpreta a Olivia Foyle en la serie.
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