Sir Thomas Herbert Parry-Williams (21 September 1887 – 3 March 1975) was a Welsh poet, author and academic. Parry-Williams was born at Tŷ'r Ysgol ('the Schoolhouse') in Rhyd Ddu, Caernarfonshire, Wales. He was educated at the University College of Wales, Aberystwyth, Jesus College, Oxford, the University of Freiburg and the Sorbonne in Paris. He was a conscientious objector during the First World War. As a poet, he was the first to win the double of Chair (for an awdl, or long poem in strict metre) and Crown (for a free verse poem) at the National Eisteddfod of Wales, a feat which he first achieved at Wrexham in 1912 and repeated at Bangor in 1915. He was Professor of Welsh at the University of Wales, Aberystwyth, from 1920 until 1952. He co-founded the university's Centre for Advanced Welsh and Celtic Studies. In 1931, while Parry-Williams was Professor of Welsh at the University of Wales, Aberystwyth, he published his own scholarly edition of the complete extant poems of Elizabethan era Welsh poet and Catholic martyr St. Richard Gwyn, along with original source material about his life in Middle Welsh, Elizabethan English, and Renaissance Latin. He was awarded D.Litt. degrees by the Universities of Wales (1934) and Oxford (1937). He was knighted in 1958. He was also given an honorary doctorate by the University of Wales in 1960 and made an Honorary Fellow of Jesus College, Oxford, in 1968.

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