- Forest Whitaker as Idi Amin
- James McAvoy as Dr. Nicholas Garrigan
- Kerry Washington as Kay Amin
- Gillian Anderson as Sarah Merrit
- Simon McBurney as Stone
- David Oyelowo as Dr. Junju
- Stephen Rwangyezi as Jonah Wasswa
- Abby Mukiibi Nkaaga as Masanga
- Adam Kotz as David Merrit
- David Ashton as Garrigan Sr.
- Barbara Rafferty as Mrs. Garrigan
- Sam Okelo as Bonny
- Sarah Nagayi as Tolu
- Chris Wilson as Perkins
- Apollo Okwenje Omamo as Mackenzie Amin
- Louis Asea as Campbell Amin
- Joanitta Bewulira-Wandera as Malyamu Amin
- Consodyne Buzabo as Nora Amin
- Shabir Mir as Zumba
- Cleopatra Koheirwe as Joy
- Michael Wawuyo as Andrew Mukooza
- Martina Amati as Italian Journalist
- Angela Kalule as Nightclub singer
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