Forest Whitaker
Idi Amin
James McAvoy
Dr. Nicholas Garrigan
Simon McBurney
British Diplomat
Gillian Anderson
Sarah Merrit
Kerry Washington
Kay Amin
David Oyelowo
Dr. Thomas Junju
Abby Mukiibi Nkaaga
Masanga
Adam Kotz
Dr. David Merrit
Barbara Rafferty
Mrs. Garrigan
David Ashton
Dr. Garrigan - Senior
Sarah Nagayi
Tolu
Stephen Rwangyezi
Jonah Wasswa
Sam Okelo
Bonny
Dick Stockley
Times Journalist
Chris Wilson
Perkins
Daniel Ssettaba
Kay Amin's Servant
Giles Foden
British Journalist 1
Andrew Williams
British Journalist 2
Martina Amati
Italian Journalist
Devon Diep
Nurse (uncredited)