The Letters of J. R. R. Tolkien is a selection of the philologist and fantasy author J. R. R. Tolkien's letters. It was published in 1981, edited by Tolkien's biographer Humphrey Carpenter, who was assisted by Christopher Tolkien. The selection, from a large mass of materials, contains 354 letters. These were written between October 1914, when Tolkien was an undergraduate at Oxford, and 29 August 1973, four days before his death. The letters are of interest both for what they show of Tolkien's life and for his interpretations of his Middle-earth writings.

Humphrey William Bouverie Carpenter was an English biographer, writer, and radio broadcaster. He is known especially for his biographies of J. R. R. Tolkien and other members of the literary society the Inklings.