John Cater (17 January 1932 – 21 March 2009) was an English actor.

His television credits include: Danger Man, Z-Cars, The Avengers, The Baron, Doctor Who (in the serial The War Machines), Follyfoot, Softly, Softly, Department S, Up Pompeii!, Dad's Army, The Naked Civil Servant, I, Claudius, Alcock and Gander, The Duchess of Duke Street, The Sweeney, Inspector Morse, Bergerac, One Foot in the Grave, Lovejoy, Jeeves and Wooster, Midsomer Murders and Doctors.

His film appearances include: The Abominable Dr. Phibes, Dr. Phibes Rises Again and Captain Kronos – Vampire Hunter.