John Selwyn Lloyd (1931 – 22 March 2023), known professionally as J. Selwyn Lloyd, was a Welsh-language author of novels for children and young adults.

Lloyd was born in Talysarn in the Nantlle Valley, a heavily Welsh-speaking area of North Wales.

Lloyd lived in Corwen.^[1] He died at a residential home in Caernarfon on 22 March 2023.^[2]

• Tir na n-Og Award in 1977 and 1983
• Tlws y Ddrama at the National Eisteddfod of Wales in 1979 for Ychydig wedi naw.
• Mary Vaughan Jones Award in 2000^[3]

• Owi Tŷ Pella (Hughes, 1960)
• Llam y Lleidr (Hughes, 1967)
• Creithiau'r gorffennol (Gwasg Gomer, 1972)
• Dychweliad y swastika (D. Brown a'i Feibion, 1973)
• Breuddwyd yw ddoe (Gwasg Gomer, 1976)
• Llygad y ddrycin (Gwasg Gwynedd, 1976)
• Trysor Bryniau Caspar (Gwasg Gomer, 1976)
• Esgyrn sychion (Gwasg Gomer, 1977)
• Ychydig wedi naw (Cyngor Gwasanaethau Gwirfoddol Clwyd, 1979)
• Llygad y daran (Gwasg Gomer, 1980)
• Brenin y paith (Gwasg Gomer, 1982)
• Croes bren yn Norwy (Gwasg Gomer, 1982; 2nd ed. 1986)
• Y Saethau duon (Gwasg Gomer 1982)
• Trwy awyr wenfflam (Gwasg Gomer, 1982)
• Wrth draed y meirw (Gwag Gomer, 1982)
• Cysgod rhyfel (Gwasg Gomer, 1983)
• Gwaed ar y dagrau (Gwasg Gomer, 1983; 2nd ed. 1988)
• Saethau ar y paith (Gwasg Gomer, 1983; 2nd ed. 1988)
• Bu farw Mel Polanski (Gwasg Gomer, 1984)
• Y Dylluan wen (Urdd Gobaith Cymru 1984)
• Y Seren Arian (Urdd Gobaith Cymru 1987)
• Trysor yn y Fynwent (Gwasg Gomer, 1988; 2nd ed. 1992)
• Elain (Gwasg Pantycelyn, 1993)
• Y Dyn a'r Groes o Haearn (Gwasg Gwynedd, 1995)
• Cai Jones ac Esgyrn y Diafol (Gwasg Gwynedd, 1989)
• Cai Jones a'r Awyren Goll (Gwasg Gwynedd, 1991)
• Cai Jones a'r Elain Wen (Gwasg Gwynedd, 1994)
• Mudan Porth y Ddraig (Gwasg Gomer, 1991)

• Saibhreas Chnoic Chaspair (Irish translation of Trysor Bryniau Caspar by Liam Mac Cóil, Oifig an tSoláthair, 1981)
• The Mute horseman of Dragon's Bay (English translation of Mudan Porth y Ddraig by the author, Pont, 1992)