| Name | Character | Episodes |
|---|---|---|
| Jill Townsend | Elizabeth Warleggan / Elizabeth Poldark / Elizabeth Chynoweth | 29 |
| Judy Geeson | Caroline Penvenen / Caroline Enys | 29 |
| Ralph Bates | George Warleggan | 29 |
| Clive Francis | Francis Poldark | 29 |
| Robin Ellis | Ross Poldark | 29 |
| Angharad Rees | Demelza | 29 |
| Mary Wimbush | Prudie Paynter | 11 |
| Richard Morant | Dr. Dwight Enys | 10 |
| Christopher Benjamin | Sir Hugh Bodrugan | 9 |
| Ralph Nossek | Harris Pascoe | 7 |
| John Baskcomb | Nat Pearce | 7 |
| Brian Stirner | Hugh Armitage | 6 |
| Julie Dawn Cole | Rowella Chynoweth / Rowella Solway | 5 |
| Eileen Way | Agatha Poldark | 3 |
| Sheila White | Keren Daniel | 3 |
| Don Henderson | Tom Carne | 3 |
| Milton Johns | Matthew Sanson | 3 |
| Patrick Westwood | Tonkin | 3 |
| Trudie Styler | Emma Tregirls | 2 |
| Duncan Lamont | Bartholomew Tregirls | 2 |
| John Ringham | Henshawe | 2 |
| Hilary Mason | Mrs. Carne | 2 |
| Michael Gwynn | Justice Lister | 2 |
| Hilary Minster | John Craven | 1 |
| Frank Middlemass | Charles Poldark | 1 |
| Gertan Klauber | Tom Harry | 1 |
| Philip Madoc | Sir Henry Bull | 1 |
| Tim Barlow | Mr. Tankard | 1 |
| Preston Lockwood | Harris Pascoe | 1 |
| Diane Holland | Lady friend | 1 |
| Ann Davies | Woman | 1 |
| Peter Baldwin | Dr. Halse | 1 |