Dylan Marlais Thomas was a Welsh poet and writer whose works include the poems "Do not go gentle into that good night" and "And death shall have no dominion", as well as the "play for voices" Under Milk Wood. He also wrote stories and radio broadcasts such as A Child's Christmas in Wales and Portrait of the Artist as a Young Dog. He became widely popular in his lifetime; and remained so after his death at the age of 39 in New York City. By then, he had acquired a reputation, which he had encouraged, as a "roistering, drunken and doomed poet".

"Do not go gentle into that good night" is a poem in the form of a villanelle by Welsh poet Dylan Thomas (1914–1953), and is one of his best-known works. Though first published in the journal Botteghe Oscure in 1951, the poem was written in 1947 while Thomas visited Florence with his family. The poem was subsequently included, alongside other works by Thomas, in In Country Sleep, and Other Poems and Collected Poems, 1934–1952. The poem entered the public domain on 1 January 2024.