Sir Daniel Lleufer Thomas (29 August 1863 – 8 August 1940) was a Welsh magistrate, social reformer, and writer.
Thomas was born on 29 August 1863 at Llethr Enoch, Cwm-du, Talley, the third child of William and Esther Thomas, at Llethr Enoch, Cwm-du, in the parish of Llandeilo-fawr.
In 1890 he was nominated to be Liberal candidate for the vacancy in East Carmarthenshire following the death of David Pugh but he withdrew before the selection conference.
[1] In 1891 he began contributing to the Dictionary of National Biography.
[2] His portrait was painted by Margaret Lindsay Williams in 1938 and currently resides in the National Museum Wales.