Lady Chatterley's Lover is the last novel by English author D. H. Lawrence, which was first published privately in 1928, in Italy, and in 1929, in France. An unexpurgated edition was not published openly in the United Kingdom until 1960, when it was the subject of a watershed obscenity trial against the publisher Penguin Books, which won the case and quickly sold three million copies. The book was also banned for obscenity in the United States, Canada, Australia, India and Japan. The book soon became notorious for its story of the physical (and emotional) relationship between a working-class man and an upper-class woman, its explicit descriptions of sex and its use of then-unprintable four-letter words.

Penguin Books is a British publishing house. It was co-founded in 1935 by Sir 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 high street 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 had a significant impact on public debate in Britain through its books on culture, politics, the arts, and science.Penguin Books is now an imprint of the worldwide Penguin Random House, a conglomerate formed in 2013 by its merger with American publisher Random House, a subsidiary of German media conglomerate Bertelsmann. Formerly, Penguin Group was wholly owned by British Pearson plc, the global media company which also owned the Financial Times. When Penguin Random House was formed, Pearson had a 47% stake in the new company, which was reduced to 25% in July 2017. Since April 2020, Penguin Random House has been a wholly owned subsidiary of Bertelsmann. It is one of the largest English-language publishers formerly known as the "Big Six"—now the "Big Five", along with Holtzbrinck/Macmillan, Hachette, HarperCollins and Simon & Schuster.Penguin Books has its registered office in the City of Westminster, London, England.