Alan Duff is a New Zealand novelist and newspaper columnist. He is best known as the author of the novel Once Were Warriors (1990), which was made into a film of the same name in 1994.

Once Were Warriors is New Zealand author Alan Duff's bestselling first novel, published in 1990. It tells the story of an urban Māori family, the Hekes, and portrays the reality of domestic violence in New Zealand. It was the basis of a 1994 film of the same title, directed by Lee Tamahori and starring Rena Owen and Temuera Morrison, which made its U.S. premiere at the Hawaii International Film Festival. The novel was followed by two sequels, What Becomes of the Broken Hearted? (1996) and Jake's Long Shadow (2002).