Alwyn David Rees (27 March 1911 – 6 December 1974) was a Welsh geographer, social anthropologist and Welsh nationalist, who wrote as Alwyn D. Rees. After studying geography and anthropology at the University College of Wales, Aberystwyth, he was a tutor in the College's External Department from 1936 to 1946. He was a lecturer in the Department of Geography and Anthropology until 1949, when he was appointed Director of the External Studies Department.[1] Rees pioneered the rural sociology of Britain with Life in a Welsh countryside (1950), a community study of the Welsh village of Llanfihangel yng Ngwynfa.[2] From 1966 until his death he edited the Welsh magazine Barn.