| Claire Foy | Queen Elizabeth II |
| Matt Smith | Philip, Duke of Edinburgh |
| Victoria Hamilton | Queen Elizabeth The Queen Mother |
| Jared Harris | King George VI |
| Vanessa Kirby | Princess Margaret |
| Eileen Atkins | Queen Mary |
| Alex Jennings | David, Duke of Windsor |
| Harriet Walter | Clemmie Churchill |
| John Lithgow | Winston Churchill |
| Jeremy Northam | Anthony Eden |
| Billy Jenkins | Prince Charles |
| Verity Russell | Young Princess Elizabeth |
| Clive Francis | Lord Salisbury |
| Nicholas Rowe | Jock Colville |
| Pip Torrens | Tommy Lascelles |
| Ben Miles | Peter Townsend |
| Daniel Ings | Mike Parker |
| Lizzy McInnerny | Bobo Macdonald |
| James Hillier | Equerry (Buckingham Palace) |
| Simon Chandler | Clement Attlee |
| Greg Wise | Lord Mountbatten |
| Patrick Ryecart | Duke of Norfolk |
| Ronald Pickup | Archbishop of Canterbury |
| Lia Williams | Wallis Simpson |
| Anna Madeley | Clarissa Eden |
| Patrick Drury | Lord Chamberlain |
| John Woodvine | Archbishop of York |
| Cory Peterson | Party Guest |
| Clare Foster | Nancy Lewis |
| John Surman | Cecil Mann, Crown Jeweller |
| Freddie Meredith | Secretary (Lambeth Palace) |
| Martin Bishop | King's Valet |
| James Woolley | Page (Marlborough House) |
| Chris Gordon | Duke of Edinburgh's Valet |
| Michael Shelford | Duke of Windsor's Valet |
| Ryan Early | Television Producer |
| Tony Guilfoyle | Bishop of Durham |
| Rosalind Knight | Princess Andrew of Greece and Denmark |
| Andy Sanderson | Prince Henry Duke of Gloucester |
| Noni Harrison | Indira Gandhi |
| Bharat Mistri | Indian Diplomat |
| Matt Beauman-Jones | Press Journalist |
| Teddy Lewis | Groundskeeper |
| Ruth Clarson-Horrocks | Peeress |
| Richard Price | Scots Guard |
| Helen Vine | Lady in theatre box |