William Henry Trethowan

William Henry Trethowan (3 June 1917 – 15 December 1995) is a psychiatrist, music director, composer, conductor, jazz trumpeter, keyboardist, teacher, writer, collector, gardener, lecturer, musical instrument maker, military officer, and reviewer. He was born in London. He died in Birmingham.

He was educated at Oundle School, Clare College, Guy's Hospital, Maudsley Hospital, and Massachusetts General Hospital. This person's employers include University of Sydney, University of Birmingham, Royal College of Psychiatrists, and University of Manchester. Awards received include Knight Bachelor and Commander of the Order of the British Empire.