Thomas Llewelyn Jones (11 October 1915 – 9 January 2009) was a Welsh language author. Over a writing career of more than 50 years, he became one of the most prolific and popular authors of children's books in Welsh. He wrote, and was generally known, as T. Llew Jones.

T. Llew Jones was born at 1 Bwlch Melyn, Pentrecwrt, Llandysul. Educated at Ysgol Gynradd Capel Graig and Llandysul Grammar School, he was a primary school teacher in various schools in Ceredigion for 35 years before becoming a full-time writer, first at Tregroes Primary School and then at Ysgol Coedybryn near Llandysul where he became headmaster. He first came to prominence as a poet, winning the chair at the National Eisteddfod in 1958 and then again in 1959.

He continued to write poetry, for children often, but was best known as a writer of adventure and detective novels for children. Many of these are historical novels based on the exploits of people such as Bartholomew Roberts and Twm Sion Cati. He published well over 50 books in total, including books for adults as well as children. Some of these are non-fiction titles, for example Ofnadwy Nos is an account of the wrecking of the Royal Charter. Some of his books have been translated into English and a number have been adapted for television.

He was awarded an honorary MA degree by the University of Wales in 1977, and in 1991 he was awarded the Mary Vaughan Jones Award, given for outstanding contributions to children's literature in Wales. In March 2005, aged nearly 90, he won the chair in Cymdeithas Ceredigion's annual Eisteddfod.

Jones died aged 93 on 9 January 2009.^[1]

A new Welsh-medium primary school, Ysgol Gynradd Gymunedol T Llew Jones, in Brynhoffnant near Llangrannog, was named in his honour in 2012. It was built to replace four small primary schools in the villages of Blaenporth, Glynarthen, Rhydlewis and Pontgarreg.^[2]

He was the father of the political activist, Emyr Llewelyn, international chess player, Iolo Ceredig Jones and Eira Prosser.

• 1958 – Chair, Welsh National Eisteddfod, Ebbw Vale
• 1959 – Chair, Welsh National Eisteddfod, Caernarfon
• 1967 – Tir na n-Og Award for Tân ar y Comin
• 1990 – Tir na n-Og Award for Lleuad yn Olau
• 1991 – Mary Vaughan Jones Award
• 2007 – Welsh Publishing Awards, "Best Seller – Poetry", for Geiriau a Gerais