| 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 |
| Robert James-Collier | Thomas Barrow
(as Rob James-Collier) |
| Phyllis Logan | Mrs. Hughes |
| Elizabeth McGovern | Cora Crawley, Countess of Grantham |
| Sophie McShera | Daisy Mason |
| 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 |
| Clare Calbraith | Jane Moorsum |
| Michael Cochrane | Reverend Travis |
| Paul Copley | Mr. Mason |
| Kevin Doyle | Joseph Molesley |
| Iain Glen | Sir Richard Carlisle |
| Allen Leech | Tom Branson |
| Kevin McNally | Horace Bryant
(as Kevin R. McNally) |
| Christine Mackie | Daphne Bryant |
| Stephen Omer | Registrar |
| David Robb | Dr. Clarkson |
| Anton Valensi | Arresting Officer
(as Anton Saunders) |
| Teresa Mahoney | Villager
(uncredited) |
| Ed Pearce | Reggie Swire
(uncredited) |