| Hugh Bonneville | Robert Crawley, Earl of Grantham |
| Laura Carmichael | Lady Edith Crawley |
| Jim Carter | Charles Carson |
| Raquel Cassidy | Baxter |
| Brendan Coyle | John Bates |
| Michelle Dockery | Lady Mary Crawley |
| Kevin Doyle | Joseph Molesley |
| Michael Fox | Andy |
| Joanne Froggatt | Anna Bates |
| Robert James-Collier | Thomas Barrow |
| Phyllis Logan | Mrs. Hughes |
| Elizabeth McGovern | Cora Crawley, Countess of Grantham |
| Sophie McShera | Daisy Mason |
| Lesley Nicol | Mrs. Patmore |
| David Robb | Dr. Clarkson |
| Maggie Smith | Violet Crawley, Dowager Countess of Grantham |
| Penelope Wilton | Isobel Crawley |
| Jeremy Swift | Spratt |
| Sue Johnston | Miss Denker |
| Ronald Pickup | Sir Michael Reresby |
| Harry Hadden-Paton | Bertie Pelham |
| Paul Putner | Mr. Skinner |
| Victoria Emslie | Audrey |
| Howard Ward | Sergeant Willis |
| Douglas Reith | Lord Merton |
| Michael Cochrane | Reverend Travis |
| Paul Copley | Mr. Mason |
| Patrick Brennan | Mr. Dawes |
| Allen Leech | Tom Branson |
| Oliver Barker | George Crawley
(uncredited) |
| Zac Barker | George Crawley
(uncredited) |
| Fifi Hart | Sybbie Branson
(uncredited) |
| Matthew Rohman | Market Stall Owner
(uncredited) |
| Eva Samms | Marigold Gregson
(uncredited) |
| Karina Samms | Marigold Gregson
(uncredited) |
| Dan Stevens | Matthew Crawley
(uncredited) |