| Tom Cruise | | Colonel Claus von Stauffenberg |
| Kenneth Branagh | | Major-General Henning von Tresckow |
| Bill Nighy | | General Friedrich Olbricht |
| Tom Wilkinson | | General Friedrich Fromm |
| Carice van Houten | | Nina von Stauffenberg |
| Thomas Kretschmann | | Major Otto Ernst Remer |
| Terence Stamp | | Ludwig Beck |
| Eddie Izzard | | General Erich Fellgiebel |
| Kevin McNally | | Dr. Carl Goerdeler (as Kevin R. McNally) |
| Christian Berkel | | Colonel Mertz von Quirnheim |
| Jamie Parker | | Lieutenant Werner von Haeften |
| David Bamber | | Adolf Hitler |
| Tom Hollander | | Colonel Heinz Brandt |
| David Schofield | | Erwin von Witzleben |
| Kenneth Cranham | | Field Marshal Wilhelm Keitel |
| Halina Reijn | | Margarethe von Oven |
| Werner Daehn | | Major Ernst John von Freyend |
| Harvey Friedman | | Dr. Joseph Goebbels |
| Matthias Schweighöfer | | Lieutenant Franz Herber |
| Waldemar Kobus | | Police Chief Wolf-Heinrich von Helldorf |
| Florian Panzner | | Second Lieutenant Hans-Wilhelm Hagen |
| Ian McNeice | | Pompous General |
| Danny Webb | | Captain Haans |
| Chris Larkin | | Sergeant Helm |
| Matthew Burton | | Lieutenant-General Adolf Heusinger |
| Philipp von Schulthess | | Tresckow's Aide |
| Wotan Wilke Möhring | | Sergeant Fritz Kolbe |
| Christian Oliver | | Sergeant-Major Arthur Adam |
| Bernard Hill | | Confident General - Desert |
| Julian Morris | | Young Lieutenant - Desert |
| Helmut Stauss | | Dr. Roland Freisler |
| Tim Williams | | Doctor |
| Karl Alexander Seidel | | Stauffenberg Child |
| Timo Huber | | Stauffenberg Child |
| Justus Kammerer | | Stauffenberg Child |
| Annika Becker | | Stauffenberg Child |
| Marie Becker | | Stauffenberg Child |
| Katharine Mehrling | | Female Singer |
| Andy Gätjen | | Angry SS Officer |
| Achim Buch | | Soldier |