Rudolf John Frederick Lehmann (2 June 1907 – 7 April 1987) was an English poet and man of letters. He founded the periodicals New Writing and The London Magazine, and the publishing house of John Lehmann Limited.
Born in Bourne End, Buckinghamshire, the fourth child of journalist Rudolph Lehmann, and brother of Helen Lehmann, novelist Rosamond Lehmann and actress Beatrix Lehmann, he was educated at Eton and read English at Trinity College, Cambridge. He considered his time at both as "lost years".
After a period as a journalist in Vienna, he returned to England to found the popular periodical New Writing (1936–1940) in book format. This literary magazine sought to break down social barriers and published works by working-class authors as well as educated middle-class writers and poets. It proved a great influence on literature of the period and an outlet for writers such as Christopher Isherwood, W. H. Auden, and miner-author B. L. Coombes. Lehmann included many of these authors in his anthology Poems for Spain which he edited with Stephen Spender. With the onset of the Second World War and paper rationing, New Writing's future was uncertain and so Lehmann wrote New Writing in Europe for Pelican Books, one of the first critical summaries of the writers of the 1930s in which he championed the authors who had been the stars of New Writing—Auden and Spender—and also his close friend Tom Wintringham and Wintringham's ally, the emerging George Orwell. Wintringham reintroduced Lehmann to Allen Lane of Penguin Books, who secured paper for The Penguin New Writing a monthly book-magazine, this time in paperback. The first issue featured Orwell's essay "Shooting an Elephant". Occasional hardback editions combined with the magazine Daylight appeared sporadically, but it was as Penguin New Writing that the magazine survived until 1950.