Watership Down is a classic heroic fantasy novel, written by English author Richard Adams, about a small group of rabbits. Although the animals in the story live in their natural environment, they are anthropomorphised, possessing their own culture, language (Lapine), proverbs, poetry, and mythology. Evoking epic themes, the novel recounts the rabbits' odyssey as they escape the destruction of their warren to seek a place in which to establish a new home, encountering perils and temptations along the way.

The novel takes its name from the rabbits' destination, Watership Down, a hill in the north of Hampshire, England, near the area where Adams grew up. The story is based on a collection of tales that Adams told to his young children to pass the time on trips to the countryside.

Published in 1972, Watership Down was Richard Adams' first novel, and is by far his most successful to date. Although it was initially rejected by 13 publishers before eventually being accepted by Rex Collings Ltd, Watership Down has never been out of print, and was the recipient of several prestigious awards. It is Penguin Books' best-selling novel of all time, and has been adapted into an acclaimed classic film and a television series. In 1996, Adams published Tales from Watership Down, a follow-up collection of 19 short stories about El-ahrairah and the rabbits of the Watership Down warren.