Penguin Classics is an imprint of Penguin Books under which classic works of literature are published in English, Spanish, Portuguese, and Korean among other languages. Literary critics see books in this series as important members of the Western canon, though many titles are translated or of non-Western origin; indeed, the series for decades since its creation included only translations, until it eventually incorporated the Penguin English Library imprint in 1986. The first Penguin Classic was E. V. Rieu's translation of The Odyssey, published in 1946, and Rieu went on to become general editor of the series. Rieu sought out literary novelists such as Robert Graves and Dorothy Sayers as translators, believing they would avoid "the archaic flavour and the foreign idiom that renders many existing translations repellent to modern taste".

Penguin Books Limited is a British publishing house. It was co-founded in 1935 by Allen Lane with his brothers Richard and John, as a line of the publishers The Bodley Head, only becoming a separate company the following year. Penguin revolutionised publishing in the 1930s through its inexpensive paperbacks, sold through Woolworths and other stores for sixpence, bringing high-quality fiction and non-fiction to the mass market. Its success showed that large audiences existed for serious books. It also affected modern British popular culture significantly through its books concerning politics, the arts, and science.