Dylan Marlais Thomas (1914-1953) was a Welsh poet who wrote in English. Many regard him as one of the 20th century's most influential poets.

In addition to poetry, Thomas wrote short stories and scripts for film and radio, with the latter frequently performed by Thomas himself. His public readings, particularly in America, won him great acclaim; his booming, at times, ostentatious voice, with a subtle Welsh lilt, became almost as famous as his works. His best-known work includes the "play for voices" Under Milk Wood and the celebrated villanelle for his dying father, "Do not go gentle into that good night." Appreciative critics have also noted the superb craftsmanship and compression of poems such as "In my craft or sullen art" and the rhapsodic lyricism of Fern Hill.