David H. Davies (1909 – 2 April 1998), known as Dai Davies, was a British trade unionist and Labour Party official.
Born in Beaufort, Ebbw Vale, Davies worked in Ebbw Vale and joined the Iron and Steel Trades Confederation. He was appointed as assistant general secretary in 1953, then general secretary in 1967, serving until 1975. He was also active in the Labour Party, and served as chairman in 1963, and treasurer in 1965.