| 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 Herber |
| Waldemar Kobus | Police Chief Wolf-Heinrich von Helldorf |
| Florian Panzner | Second Lieutenant 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 Kolbe |
| Christian Oliver | Sergeant-Major Adam |
| Bernard Hill | Confident General - Desert |
| Julian Morris | Young Lieutenant - Desert |
| Helmut Stauss | Dr. Roland Freisler |
| Tim Williams | Doctor |
| Karl Alexander Seidel | Berthold von Stauffenberg (as Alexander Seidel) |
| Timo Huber | Franz von Stauffenberg |
| Justus Kammerer | Heimeran von Stauffenberg |
| Annika Becker | Valerie von Stauffenberg |
| Marie Becker | Valerie von Stauffenberg |
| Katharine Mehrling | Female Singer |
| Andy Gatjen | Angry SS Officer (as Andy Gätjen) |
| Achim Buch | Soldier |
| Manfred-Anton Algrang | Albert Speer (as Anton Algrang) |
| Matthias Freihof | Reichsführer Heinrich Himmler |
| Gerhard Haase-Hindenberg | Reich Marshal Hermann Göring |
| Jon Collin Barclay | Second Lieutenant Kretz |
| Matthias Ziesing | Young Officer - Wolf's Lair |
| Tom Wlaschiha | Communications Officer |
| Carsten Voigt | Checkpoint Guard |
| O'Shea Miles | Sentry - OKH (as Miles O'Shea) |
| Anna Holmes | Central Communications Operator |
| Michael Schumacher | Young Officer |
| Niklas Bardeli | Aide to Stauffenberg |
| Christoph Förster | Aide to Stauffenberg |
| Andrew Schwerdt | Keitel's Adjutant (as Andre Schwedt) |
| Isabella Drischel | War Ministry Secretary |
| Max Urlacher | Officer |
| Justin Beard | Wolf's Lair Operator |
| Tilmann von Blomberg | Arresting Officer |
| Karsten Mielke | Remer's Driver |
| Tommy Kijas | Young S.S. Officer - Desert (scenes deleted) |
| Marek Oravec | Young Lieutenant |
| Jason Barry | SS Officer (uncredited) |
| Joel Bryant | S.S. Soldier (uncredited) |
| Mike Dunn | German Motorcycle Driver - Afrika Scene (uncredited) |
| Wolfgang Grossmann | Standartenführer Neuner (uncredited) |
| Michael Ihnow | Officer (uncredited) |
| Efka Kvaraciejus | Berghoff SS Soldier (uncredited) |
| Kyle Leatherberry | SS Officer #3 (uncredited) |
| Hendrik Maaß | Wehrmacht Soldier / Wehrmacht First Lieutenant (uncredited) |
| Jacob Newton | Nazi Soldier (uncredited) |
| Dylan Saccoccio | Shirtless German Soldier (uncredited) |
| Gubbi Sigurdsson | German Soldier (uncredited) |
| Sean Velie | Injured Soldier - Desert (uncredited) |
| Nicolas Walier | Waiter2 (uncredited) |