John Thomas Brown Dumelow Platts (23 November 1848 – 6 August 1898) was an English cricketer who played for Derbyshire between 1871 and 1884. He was a member of the team that played Derbyshire's first match in May 1871. Platts was a left-handed batsman and a right-arm round-arm slow bowler, with the added bonus of some occasionally fiendish pace to his straight-arm action. Platts started umpiring in 1885 immediately after he stopped playing and officiated at 69 first-class games until 1896. Later, John Platts was diagnosed with tuberculosis and died at his home in August 1898, at the age of 49.