David James Davies (1893–1956), known as D. J. Davies, was a Welsh economist, industrialist, prize winning essayist, author, political activist, pilot, and an internationalist. Davies was a world traveller before returning home to Wales. Initially a founding member of the Welsh Labour Party in the Ammanford district, in 1925 he left Labour becoming a founding member of Plaid Cymru, the nationalist party of Wales.