Tropic of Cancer is a novel by Henry Miller that has been described as "notorious for its candid sexuality" and as responsible for the "free speech that we now take for granted in literature." It was first published in 1934 by the Obelisk Press in Paris, France, but this edition was banned in the United States. Its publication in 1961 in the U.S. by Grove Press led to obscenity trials that tested American laws on pornography in the early 1960s. In 1964, the U.S. Supreme Court declared the book non-obscene. It is regarded as an important work of 20th-century literature.

Tropic of Cancer redefined the novel. Set in Paris in the 1930s, it features a starving American writer who lives a bohemian life among prostitutes, pimps, and artists. Banned in the US and the UK for more than thirty years because it was considered pornographic, Tropic of Cancer continued to be distributed in France and smuggled into other countries. When it was first published in the US in 1961, it led to more than 60 obscenity trials until a historic ruling by the Supreme Court defined it as a work of literature. Long hailed as a truly liberating book, daring and uncompromising, Tropic of Cancer is a cornerstone of modern literature that asks us to reconsider everything we know about art, freedom, and morality.