“Do not go gentle into that good night” is a poem in the form of a villanelle by Welsh poet Dylan Thomas (1914–1953), considered his best-known work .Though first published in the journal BottegheOscure in 1951the poem was written in 1947 while Thomas visited Florence with his family. Subsequent publication, along with other Thomas works, include In Country Sleep, And Other Poems (New Directions, 1952)and Collected Poems, 1934–1952 (Dent, 1952)

It has been suggested that the poem was written for Thomas’s dying father, although he did not die until just before Christmas 1952. It has no title other than its first line, “Do not go gentle into that good night”, a line that appears as a refrain throughout the poem along with its other refrain, “Rage, rage against the dying of the light”.