| 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 |
| Matthew Goode | Henry Talbot |
| Harry Hadden-Paton | Bertie Pelham |
| Lily James | Lady Rose MacClare |
| Robert James-Collier | Thomas Barrow |
| Allen Leech | Tom Branson |
| 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 |
| Sue Johnston | Miss Denker |
| Jeremy Swift | Spratt |
| Patrick Brennan | Mr. Dawes |
| Douglas Reith | Lord Merton |
| Samantha Bond | Lady Rosamund Painswick |
| Alastair Bruce | Brancaster Butler |
| Patricia Hodge | Mrs. Pelham |
| Phoebe Sparrow | Amelia Grey |
| James Greene | Sir Mark Stiles |
| Paul Copley | Mr. Mason |
| Charlie Anson | Larry Grey |
| Matt Barber | Atticus Aldridge |
| Peter Egan | Hugh 'Shrimpie' MacClare, Marquess of Flintshire |
| Paul Prescott | At the Hospital Meeting |
| Alice Shuttleworth | At the Hospital Meeting |
| Kyra Williams | At the Hospital Meeting |
| Antonia Bernath | Laura Edmunds |
| Michael Cochrane | Reverend Travis |
| James Francis Andrews | Wedding Guest |
| Oliver Barker | George Crawley |
| Zac Barker | George Crawley |
| Alan Billingham | At the Hospital Meeting |
| Dilyana Bouklieva | (uncredited) |
| Ray Burnet | The Verger |
| Richard Butler | Northumbrian Piper |
| Nick Davison | Upper Class Wedding Guest |
| Fifi Hart | Sybbie Branson |
| Amir Heath | Waiter at the Ritz |
| Isis | Dog |
| Matt Jamie | Dinner Guest |
| Hilary Joyce | Diner |
| Hugh O'Brien | Diner |
| Eva Samms | Marigold Gregson |
| Karina Samms | Marigold Gregson |
| Graham Saxon | Town folk |
| Charlie Watson | Albert the Hallboy |