Roland Glyn Mathias (4 September 1915 – 16 August 2007), was a Welsh writer, known for his poetry and short stories. He was also a literary critic, and responsible with Raymond Garlick for the success of the literary magazine Dock Leaves (from 1949), later from 1957 The Anglo-Welsh Review. He edited it from 1961 to 1976. His other writing includes books on David Jones, Vernon Watkins and John Cowper Powys, and Anglo-Welsh Poetry 1480-1980 with Raymond Garlick.
He was born at Talybont-on-Usk, south-east of Brecon in Powys, in 1915 and brought up mostly in England and Germany. He graduated in history from Jesus College, Oxford. Days Enduring (1942) was his first poetry collection. He was a pacifist, and was twice gaoled in World War II as a conscientious objector. His career was in teaching, in Wales and elsewhere in the UK where he served as Headmaster of King Edward VI Five Ways School from 1964 to 1969; he retired to Brecon in 1969 and died in 2007. Buried at Aber Chapel on the outskirts of Talybont on Usk.
His son, Jonathan Glyn Mathias, known as Glyn Mathias, is a well known political correspondent.