The story of the miraculous evacuation of Allied soldiers from Belgium, Britain, Canada and France, who were cut off and surrounded by the German army from the beaches and harbour of Dunkirk between May 26th and June 4th 1940 during World War II.
| Tommy | Fionn Whitehead |
| Farrier | Tom Hardy |
| Mr. Dawson | Mark Rylance |
| Commander Bolton | Kenneth Branagh |
| Shivering Soldier | Cillian Murphy |
| George | Barry Keoghan |
| Alex | Harry Styles |
| Gibson | Aneurin Barnard |
| French Soldier | Damien Bonnard |
| Grenadier | Lee Armstrong |
| Irate Soldier | James Bloor |
| Peter | Tom Glynn-Carney |
| Collins | Jack Lowden |
| Warrant Officer | Luke Thompson |
| French Soldier 2 | Michel Biel |
| French Soldier 3 | Constantin Balsan |
| Petty Officer | Billy Howle |
| Soldier | Mikey Collins |
| Stretcher Bearer | Callum Blake |
| Soldier at the Gap | Dean Ridge |
| Able Seaman | Bobby Lockwood |
| Second Lieutenant | Will Attenborough |
| Lieutenant | Tom Nolan |
| Colonel Winnant | James D'Arcy |
| Rear Admiral | Matthew Marsh |
| Sub-Lieutenant | Adam Long |
| Nurse | Miranda Nolan |
| Sailor | Bradley Hall |
| Lifeboat Soldier 1 | Jack Cutmore-Scott |
| Lifeboat Soldier 2 | Brett Lorenzini |
| Engineer | Michael Fox |
| Highlander 1 | Brian Vernel |
| Highlander 2 | Elliott Tittensor |
| Highlander 3 | Kevin Guthrie |
| Private | Harry Richardson |
| Dutch Seaman | Jochum ten Haaf |
| Junior Naval Officer | Johnny Gibbon |
| Heinkel Spotter | Richard Sanderson |
| Stewardess | Kim Hartman |
| Deal Sailor | Calam Lynch |
| Corporal | Charley Palmer Rothwell |
| Furious Soldier | Tom Gill |
| Blind Man | John Nolan |
| Lone Private | Bill Milner |
| Soldier on RN Launch | Jack Riddiford |
| Boy | Harry Collett |
| Man at Railway Window | Eric Richard |
| Voice on Radio (uncredited) | Michael Caine |
| Captain Marshall (uncredited) | Johnny Otto |
| British Soldier (uncredited) | Nick Howden-Steenstra |
