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

Stephen Rwangyezi

Jonah Wasswa

Dick Stockley

Times Journalist

Chris Wilson

Perkins

Daniel Ssettaba

Kay Amin's Servant

Giles Foden

British Journalist 1

Andrew Williams

British Journalist 2

Devon Diep

Nurse (uncredited)