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Unni Maria Lindell (born 3 April 1957 in Oslo) is a Norwegian writer. She is best known for her crime novels (whodunits), but has also written a collection of poems and several children's and young adult books.
Lindell worked as a journalist before she became an author. Her first book Den grønne dagen ("The green day") was published in 1986. One of Lindell's most prominent characters is detective Cato Isaksen. Some of the Isaksen books have been adapted as TV films starring Reidar Sørensen.
Lindell was awarded the Mads Wiel Nygaards Endowment in 1998 and the Critics' Prize for the year's best children's or youth literature. In 1999 and in 2018 she received the Riverton Prize (Rivertonprisen), a literature award given annually to the best Norwegian detective story.