John Davies (25 April 1938 – 16 February 2015) was a Welsh historian, and a television and radio broadcaster. He attended university at Cardiff and Cambridge and taught Welsh at Aberystwyth. He wrote a number of books on Welsh history.
Davies was married with four children. After teaching Welsh history at the University of Wales, Aberystwyth, he retired to Cardiff, and appeared frequently as a presenter and contributor to history programmes on television and radio.
In the mid-1980s, Davies was commissioned to write a concise history of Wales by Penguin Books to add to its Pelican series of the histories of nations. The decision by Penguin to commission the volume in Welsh was "unexpected and highly commendable," wrote Davies.
"I seized the opportunity to write of Wales and the Welsh. When I had finished, I had a typescript which was almost three times larger than the original commission," wrote Davies. The original voluminous typescript was first published in hardback under the Allen Lane imprint. Davies took a sabbatical from his post at the University College of Wales and wrote most of the chapters while touring Europe. Davies dedicated Hanes Cymru to his wife, Janet Mackenzie Davies.
Hanes Cymru was translated into English and published in 1993, as there was "a demand among English-speakers to read what was already available to Welsh-speakers," wrote Davies. A revised edition was published (in both languages) in 2007
In 2005, Davies received the Glyndŵr Award for an Outstanding Contribution to the Arts in Wales during the Machynlleth Festival. He won the 2010 Wales Book of the Year for Cymru: Y 100 lle i'w gweld cyn marw.
Davies lived in Grangetown, Cardiff. To mark his 75th birthday in 2013, the Welsh language television channel S4C broadcast a programme, Gwirionedd y Galon: Dr John Davies, about his life and his home and in 2014 published his autobiography in Welsh.