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| Peter Mullan | Ted Narracott |
| Jeremy Irvine | Albert Narracott |
| Peter Mullan | Ted Narracott |
| Emily Watson | Rose Narracott |
| Benedict Cumberbatch | Major Stewart |
| Emily Watson | Rose Narracott |
| Niels Arestrup | Grandfather |
| David Thewlis | Lyons |
| David Thewlis | Lyons |
| David Kross | Gunther |
| Toby Kebbell | Geordie |
| Tom Hiddleston | Captain Nicholls |
| Tom Hiddleston | Captain Nichols |
| Benedict Cumberbatch | Maj. Jamie Stewart |
| Celine Buckens | Emilie |
| Pip Torrens | Major Tompkins |
| Patrick Kennedy | Lt. Waverly |
| Toby Kebbell | Geordie Soldier |
| Patrick Kennedy | Lt. Charlier Waverly |
| Nicolas Bro | Friedrich |
| Leonhard Carow | Michael |
| Leonard Carow | Michael |
| Geoff Bell | Sgt. Sam Perkins |
| David Kross | Gunther |
| Rainer Bock | Brandt |
| Jeremy Irvine | Albert |
| Matt Milne | Andrew Easton |
| Robert Emms | David Lyons |
| Celine Buckens | Emilie |
| Eddie Marsan | Sgt. Fry |
| Robert Emms | David Lyons |
| Nicolas Bro | Friedrich |
| Rainer Bock | Brandt |
| Hinnerk Schönemann | German Soldier in No Man's Land |
| Gary Lydon | Si Easton |
| Geoff Bell | Sgt. Sam Perkins |
| Liam Cunningham | Army Doctor |
| Sebastian Hülk | German Officer at Farm |
| Gerard McSorley | Market Auctioneer |
| Tony Pitts | Sgt. Martin |
| Irfan Hussein | Sgt. Maj. Singh |
| Pip Torrens | Maj. Tompkins |
| Philippe Nahon | French Auctioneer |
| Jean-Claude Lecas | Butcher |
| Justin Brett | Motorbike Rider |
| Seamus O'Neill | Devon Farmer #1 |
| Pat Laffan | Devon Farmer #2 |
| Peter O'Connor | British Trench Solder #2 (as Peter McNeil O'Connor) |
| Trystan Wyn Puetter | German Trench Soldier #1 (as Trystan Pütter) |
| Peter McNeil O'Connor | British Trench Solder #2 |
| Gunnar Atli Cauthery | German Trench Soldier #2 (as Gunnar Cauthery) |
| Trystan Pütter | German Trench Soldier #1 |
| Julian Wadham | Trench Captain |
| Gunnar Cauthery | German Trench Soldier #2 |
| Anian Zollner | Senior German Officer |
| Michael Kranz | Junior German Officer |
| Hannes Wegener | German Officer |
| David Dencik | Base Camp Officer |
| Edward Bennett | Cavalry Recruiting Officer |
| Johnny Harris | Infantry Recruitment Officer |
| Philip Hill-Pearson | Wounded Soldier |
| Tam Dean Burn | Medic in Trench |
| David Crossman | Costume Supervisor |
| Alain Williams | Hospital Orderly |
| Thomas Arnold | Shouting German Officer |
| Maximilian Brückner | German Artillery Officer (as Maximilian Brüeckner) |
| Markus Tomczyk | German Artillery Soldier |
| Peter Benedict | German Officer on Bridge |
| Callum Armstrong | Bagpiper |
| Martin Dew | Lyons' Cronie (as Martin D. Dew) |
| Jason Crook Cookie | German NCO |
| Ray Holder | Fred Goddard |
| Roy Holder | Fred Goddard |
| Stephen Molloy | British Trench Soldier |
| Paul Alexander | Dave Hill |
| Michael Ryan | British Trench Solder #1 |
| Maggie Ollerenshaw | Narracott's Neighbor |
| Alan Williams | Hospital Orderly |
| Beth Ogden | David Lyons' Girlfriend |
| John Williams | Composer |
| Janusz Kaminski | Cinematographer |
| Lasco Atkins | British Soldier (uncredited) |
| Jina Jay | Casting Director |
| Jadran Malkovich | German Lieutenant |
| Michael Kahn | Editor |
| Chris Bowe | Scottish Highlander at Auction (uncredited) |
| Robert Clayton | British Soldier (uncredited) |
| Rick Carter | Production Designer |
| Edgar Canham | Boy on Bicycle (uncredited) |
| Bryn Lawrence | Stunt Coordinator |
| David Appleby | Still Photographer |
| Andrew Ackland-Snow | Art Director |
| Andrew Cooper | Still Photographer |
| Sam Creed | Soldier (uncredited) |
| Alastair Bullock | Art Director |
| Molly Hughes | Art Director |
| David Devlin | Gaffer |
| Graham Curry | Scottish Highlander at Auction (uncredited) |
| Jason Cookie Crook | German Non-Commissioned Officer |
| Marco Alicea | digital audio transfer |

