William Edward Hopkin (28 January 1888 – 23 September 1953) was a Welsh trade union leader.
Hopkin became active in the National Union of Gas Workers and General Labourers, and began working full-time for the union in 1911.
He served with the Royal Navy during World War I, but returned to the union, and in 1920, was appointed as the secretary of its South Wales district.
In 1949, he was part of a Trades Union Congress delegation to the United States, tasked with studying methods of industrial production there.
[1] In 1947, Hopkin was made an Officer of the Order of the British Empire, and in 1949 he became a magistrate.