Dafydd Glyn Jones (born 1941) is a Welsh scholar and lexicographer, born in the village of Carmel, Gwynedd. He is a specialist in Middle Welsh prose, and his other interests include Welsh history, Robert Jones, Rhoslan, and the life and work of Emrys ap Iwan.
He was educated at Carmel Primary School and at Ysgol Dyffryn Nantlle, Penygroes. He graduated from the University College of North Wales, Bangor and from Linacre College, Oxford.
He spent many years as a lecturer and senior lecturer in Welsh Language and Literature at the University of Wales, Bangor. With his co-editor Bruce Griffiths he edited the Welsh Academy English-Welsh Dictionary (Geiriadur yr Academi). He retired from the University in 2000.
Dafydd Glyn Jones is the author of a number of articles on subjects connected with Welsh literature and history, e.g.
A collection of his writings on Welsh history are published in: