John Alderton is an English actor. He is best known for his roles in Upstairs, Downstairs, Thomas & Sarah, Wodehouse Playhouse, Little Miss, Please Sir!, No, Honestly and Fireman Sam. Alderton has often starred alongside his wife, Pauline Collins.

Thomas & Sarah is a British drama series that aired on ITV in 1979. A spin-off from the BAFTA Award-winning series Upstairs, Downstairs, it stars John Alderton and Pauline Collins reprising their Upstairs, Downstairs roles.