The production featured a cast of well-known character actors, of whom the film star Kenneth More was the most famous name.
- Terence Alexander as Montague ‘Monty’ Dartie
- John Barcroft as George Forsyte
- June Barry as June Forsyte
- John Bennett as Philip Bosinney
- Jonathan Burn as Val Dartie
- Fay Compton as ‘Aunt Ann’ Forsyte
- Karin Fernald as Anne Forsyte née Wilmot
- Susan Hampshire as Fleur Mont née Forsyte
- Ursula Howells as Frances Forsyte
- Martin Jarvis as Jolyon ‘Jon’ Forsyte
- Maggie Jones as Smither
- Cyril Luckham as Sir Lawrence Mont
- Kenneth More as ‘Young Jolyon’ Forsyte
- Lana Morris as Helene Hillmer
- Suzanne Neve as Holly Dartie née Forsyte
- Nora Nicholson as Aunt Juley Small
- Joseph O’Conor as ‘Old Jolyon’ Forsyte
- Dalia Penn as Annette Forsyte née Lamotte
- Nicholas Pennell as Michael Mont
- Robin Phillips as Wilfrid Desert
- Eric Porter as Soames Forsyte
- Nyree Dawn Porter as Irene Forsyte née Heron
- Kynaston Reeves as Nicholas Forsyte
- Fanny Rowe as Emily Forsyte
- Nora Swinburne as ‘Aunt Hester’ Forsyte
- Margaret Tyzack as Winifred Dartie
- John Welsh as James Forsyte
- Julia White as Coaker
- George Woodbridge as Swithin Forsyte
- Michael York as Jolyon ‘Jolly’ Forsyte
- Ian Trigger as Greenwater