| Hugh Bonneville | Robert Crawley, Earl of Grantham |
| Jessica Brown Findlay | Lady Sybil Crawley |
| Laura Carmichael | Lady Edith Crawley |
| Jim Carter | Charles Carson |
| Brendan Coyle | John Bates |
| Michelle Dockery | Lady Mary Crawley |
| Siobhan Finneran | Sarah O'Brien |
| Joanne Froggatt | Anna Smith |
| Thomas Howes | William Mason |
| Robert James-Collier | Thomas Barrow
(as Rob James-Collier) |
| Phyllis Logan | Mrs. Hughes |
| Elizabeth McGovern | Cora Crawley, Countess of Grantham |
| Sophie McShera | Daisy Robinson |
| Lesley Nicol | Mrs. Patmore |
| Amy Nuttall | Ethel Parks |
| Maggie Smith | Violet Crawley, Dowager Countess of Grantham |
| Dan Stevens | Matthew Crawley |
| Penelope Wilton | Isobel Crawley |
| Zoe Boyle | Lavinia Swire |
| Danny Burns | Stretcher Bearer |
| Gwendolen Chatfield | White Feather Girl |
| Rosie Jones | White Feather Girl |
| Jeremy Clyde | General Robertson |
| Kevin Doyle | Joseph Molesley |
| Maria Doyle Kennedy | Vera Bates |
| Richard Hansell | Medical Officer |
| Allen Leech | Tom Branson |
| Peter McNeil O'Connor | Sergeant Stevens |
| David Robb | Dr. Clarkson |
| Stephen Ventura | Davis |
| Peter Agnelli | Villager
(uncredited) |
| Graham Bandy | Medical Orderley /
Melodeon Player
(uncredited) |
| Greg Bennett | Officer at Benefit Concert
(uncredited) |
| Robert Clayton | Injured Soldier
(uncredited) |