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Fredrik Skagen (born 30 December 1936) is a Norwegian writer. He is best known for his crime fiction, but is also the author of some children's books and several radio plays. His first book was published in 1968 His works have been translated into German, Danish, Swedish, Dutch and French.

Skagen has received several awards, including the Norwegian Booksellers' Prize in 1985 and the Glass Key Award in 1996 for best Nordic crime novel.