Sir Harry Platt, 1st Baronet, FRCS (7 October 1886 – 20 December 1986) was an English orthopaedic surgeon, President of the Royal Society of Medicine (1931-1932) and of the Royal College of Surgeons of England (1954-1957). He was a founder of the British Orthopaedic Association, of which he became President in 1934-1935.
He was born in Thornham, Royton, Lancashire, the son of Ernest Platt, a velvet cutter and later chairman of United Velvet Cutters, Ltd. Harry developed a tuberculous knee as a child and his early education was at home. He entered the Victoria University of Manchester to study medicine and qualified in 1909 from both Victoria and London Universities. After resident and registrar appointments he demonstrated anatomy at Manchester Royal Infirmary. His orthopaedic training was mainly at the Royal National Orthopaedic Hospital in London, and in Boston, USA. On his return to England in 1914 he was appointed surgeon at Ancoats Hospital but on the outbreak of World War I he was appointed to be surgeon-in-charge of a military orthopaedic centre in Manchester as a captain in the Royal Army Medical Corps.
By 1932, his posts included being senior honorary surgeon and surgeon-in-charge of the orthopaedic service, Ancoats Hospital, as consulting orthopaedic surgeon for Lancashire County Council and in 1939 he advanced on his earlier status as a clinical lecturer in orthopaedic surgery at the University of Manchester when he was appointed professor. He became a Knight Bachelor in 1948.