John Cator (21 March 1728 – 26 February 1806) was an English timber merchant and politician who sat in the House of Commons between 1772 and 1793. He became a landowner and property developer with estates in later life in: Blackheath, Beckenham, Addington, Croydon and Waltham Forest – now in London, then in Kent, Surrey and Essex; at Leigh and Hever in Kent.