Sir John William Bowen CBE (8 May 1876 – 1 April 1965), known as William Bowen, was a British trade unionist and politician. Born and educated in Gowerton in Glamorgan, Bowen left school aged eleven to work at the Post Office. He soon became an active trade unionist, joining the Postmen's Federation, of which he became chair in 1916. He was also active in the Labour Party and stood unsuccessfully for it in Newport, Monmouthshire at the 1918 general election and in several elections subsequently.