Jack Klaff (born in Johannesburg, South Africa)is an actor, writer, director and academic.

Klaff has held four visiting professorships at Princeton University and was for four years Professor of the Public Understanding of Science at Starlab in Brussels.

His TV credits include the role of Rawdon Crawley in the 1987 BBC series of Vanity Fair, Death is Part of the Process, Road Rage, Freddie and Max, Agatha Christie's Poirot, Sherlock Holmes and Midsomer Murders. His many radio performances have included the parts of Quasimodo, Oscar Wilde, The Sea Wolf and Roderick Spode. As a playwright and solo artist he has performed at the Edinburgh Festival and in venues around the world. Several of his dramas and one man shows have been broadcast on TV and radio including Nagging Doubt - based on his connection with South Africa, Kafka, Letters Alone and The 50 Minute Hour. His films include the original Star Wars movie, For Your Eyes Only, 1871, King David and Hotet -The Threat.

This theater credits include: Full Circle~2006 - Oom (Oval House, Kensington Oval, UK), Full Circle Copenhagen~2006 - Niels Bohr (Watford Palace Theatre, Watford, Herts, UK), The Representative~2006 - Cardinal/Manufacturer (Finborough Theatre, London, UK), Malvolio~2006 - Sir Toby Belch (Southwark Playhouse, London, UK), Jack Klaff as Sir Toby Belch in Malvolio Hamlet, The Outsider~2006 - Claudius (Southwark Playhouse, London, UK), Cherry Orchard, The~1997 - Leo Guyver (Birmingham Repertory, Birmingham, UK); A Midsummers Nights Dream, (Southern Shakespeare Festival, Tallahassee, US), Whole Shebang, The Insignificance~1995 - Joe DiMaggio (Donmar Warehouse, UK), Julius Caesar~1980 - Titinius (Riverside Studios, UK), Troilus and Cressida, Donkey's Years (Bristol Old Vic, UK), Matchmaker at Her Majesty's Theatre (Bristol Old Vic, UK), Macbeth (Bristol Old Vic, UK), Hard Times - Stephen Blackpool Dr. Jekyll of Rodney Street~ - Trigorin/Dr. Jekyll/Mr. Hyde (Liverpool Everyman Theatre Company), Sons of Light, The~ 1978 - Gower (Royal Shakespeare Company), As You Like It ~ 1977, Charles (Royal Shakespeare Company), Henry VI ~ 1977 - Clarence (Royal Shakespeare Company), The Matchmaker (Her Majesty's Theatre), A Thought in Three Parts (Joint Stock, ICA)