Jenkyn Beverley Smith, FLSW, FRHistS (27 September 1931 – 19 February 2024), published as J. Beverley Smith, was a Welsh historian of medieval Wales, who was successively Sir John Williams Professor of Welsh History (1986–1995), Research Professor of Welsh History (1995–1999) and Emeritus Professor (1999–2024) at Aberystwyth University.