- Jamie Dornan
- Patrick Quinlan
- Emmanuelle Seigner
- Madame LaFontagne
- Mark Strong
- Conor Cruise O'Brien
- Mikael Persbrandt
- Dag Hammarskjold
- Michael McElhatton
- General McEntee
- Danny Sapani
- Moise Tshombe
- Sam Keeley
- Bill (Sniper) Ready
- Jason O'Mara
- Jack Prendergast
- Ronan Raftery
- John Gorman
- Mike Noble
- Charles Cooley
- Charlie Kelly
- Walter Hegarty
- Conor MacNeill
- Radio Operator
- Fionn O'Shea
- William Reidy
- Conor Quinlan
- Patrick Joyce
- Jordan Mifsud
- John Donnelly
- Richard Lukunku
- Patrice Lumumba
- Andrew Stock
- Man in a White Suit
- Fiona Glascott
- Carmel Quinlan
- Melissa Haiden
- Beautiful Nurse
- Charmaine Weir-Smith
- Cooley's Mother
- Danny Keogh
- Gorman's Father
- Thulasizwe Kubheka
- Tshombe's Aide
- Robert van de Coolwijk
- German Shopkeeper
- Luc Van Grunderbeeck
- President Charles de Gaulle
- Ashish Gangapersad
- General Raja
- Guillaume Canet
- Rene Faulques
- Gérard Rudolf
- Black Jack
- Mike Bodie
- Desmond the Assistant
- Kyle Ryan Diffenthal
- Priest
- Alexander Tops
- Medic
- Garth Breytenbach
- Griffin the Irish Merc
- Leon Clingman
- U.N. Inspector
- Ashley Taylor
- United States Ambassador
- Michael Richard
- USSR Ambassador
- Robert Hobbs
- Kane
- Michael Hillberg
- Voice
- Edwin Jay
- Mercenary
- Chris van Rensburg
- Dag's Assistant