Erewhon is a novel by Samuel Butler, published anonymously in 1872. The title is also the name of a country, supposedly discovered by the protagonist. In the novel, it is not revealed where Erewhon is, but it is clear that it is a fictional country. Butler meant the title to be read as the word Nowhere backwards, even though the letters "h" and "w" are transposed, therefore Erewhon is an anagram of nowhere. The book is a satire on Victorian society.

The first few chapters of the novel dealing with the discovery of Erewhon are in fact based on Butler's own experiences in New Zealand where, as a young man, he worked as a sheep farmer on Mesopotamia Station for about four years (1860–1864), and explored parts of the interior of the South Island.

Sometimes compared to Gulliver's Travels (1726), a classic novel by Jonathan Swift; the image of Utopia in this latter case also bears strong parallels with the self-view of the British Empire at the time.