Thomas Henry Thomas (31 March 1839 – 9 July 1915) was a Welsh artist particularly active in Cardiff. He was also interested in botany, geology, history, and archaeology which were often the subjects of his art works. He was a Fellow of the Royal Cambrian Academy of Art which was established in 1881. He was a leading force behind the founding of the National Museum of Wales and in the use of the red dragon symbolizing Wales.