Ronald Stuart Thomas, anavezetoc'h evel R. S. Thomas (1913 - 2000) a oa ur beleg anglikan (yr Eglwys yng Nghymru) kembreat hag ur barzh saoznek. Komz-plaen en deus skrivet e kembraeg ivez. Desket en doa kembraeg ha broadelour kembreat e oa.

• The Stones of the Field (1946) Druid Press, Carmarthen
• An Acre of Land (1952) Mongtomeryshire Printing Co, Newtown
• The Minister (1953) Mongtomeryshire Printing Co, Newtown
• Song at the Year's Turning (1955) Rupert Hart-Davis, London
• Poetry for Supper (1958) Rupert Hart-Davis, London
• Judgement Day, Poetry Book Society, 1960
• Tares, [Corn-weed] (1961) Rupert Hart-Davis, London
• The Bread of Truth (1963) Rupert Hart-Davis, London
• Words and the Poet (1964, prezegenn) University of Wales Press, Cardiff
• Pietà (1966) Rupert Hart-Davis, London
• The Mountains (1968), skeudennaouet gant John Piper, Chilmark Press
• Postcard: Song (1968) Fishpaste Postcard Series
• Not That He Brought Flowers (1968) Rupert Hart-Davis, London
• H'm (1972) Macmillan, London
• Selected Poems, 1946-1968, Hart-Davis MacGibbon, 1973, St. Martin's, 1974.
• What is a Welshman? (1974) Christopher Davies Publishers, Swansea
• Laboratories of the Spirit (1975) Macmillan, London
• Abercuawg (1976, prezegenn) Cyngor Celfyddydau Cymru
• The Way of It (1977) Ceolfrith Press, Sunderland,
• Frequencies (1978) Macmillan, London
• Between Here and Now (1981) Macmillan, London
• Later Poems, 1972-1982 (1983) Macmillan (London)
• A Selection of Poetry (1983) edited by D. J. Hignett, Hignett School Services
• Poets' Meeting (1983) Celandine
• Ingrowing Thoughts (1985) Poetry Wales Press, Bridgend
• Neb (1985) (Welsh, third person autobiography), Gwasg Gwynedd, Caernarfon
• Destinations (1985) Celandine
• Poems of R. S. Thomas (1985) University of Arkansas Press
• Experimenting with an Amen (1986) Macmillan, London
• Welsh Airs (1987) Seren, Bridgend
• The Echoes Return Slow (1988) Macmillan, London
• Counterpoint (1990) Bloodaxe Books, Newcastle-upon-Tyne
• Blwyddyn yn Llŷn (1990) (in Welsh)
• Pe Medrwn Yr Iaith : ac ysgrifau eraill ed. Tony Brown & Bedwyr L. Jones (1990), Christopher Davies Publishers, Swansea
• Cymru or Wales? (1992) Gomer
• Mass for Hard Times (1992) Bloodaxe Books, Newcastle-upon-Tyne
• Collected Poems, 1945-1990 (1993) Dent
• No Truce with the Furies (1995) Bloodaxe Books, Newcastle-upon-Tyne
• Autobiographies (1997, komz-plaen) Phoenix Books, London
• Residues (2002, dalif) Bloodaxe Books, Newcastle-upon-Tyne
• Collected Later Poems 1988-2000 (2004, dalif) Bloodaxe Books, Newcastle-upon-Tyne
• Uncollected Poems ed. Tony Brown & Jason Walford Davies (2013, dalif), Bloodaxe Books, Newcastle-upon-Tyne