Per Petterson (born 18 July 1952 in Oslo) is a Norwegian novelist. His debut book was Aske i munnen, sand i skoa (1987), a collection of short stories. He has since published a number of novels to good reviews. To Siberia (1996), set in the Second World War, was published in English in 1998 and nominated for the Nordic Council's Literature Prize. I kjølvannet, translated as In the Wake (2002), is a young man's story of losing his family in the Scandinavian Star ferry disaster in 1990 (Petterson himself lost his mother, father, younger brother and a niece in the disaster); it won the Brage Prize for 2000. His 2008 novel Jeg forbanner tidens elv (I Curse the River of Time) won The Nordic Council's Literature Prize for 2009, with an English translation published in 2010.

His breakthrough novel was Ut og stjæle hester (2003), which was awarded two top literary prizes in Norway – the Norwegian Critics Prize for Literature and the Booksellers’ Best Book of the Year Award. The 2005 English language translation, Out Stealing Horses, was awarded the 2006 Independent Foreign Fiction Prize and the 2007 International IMPAC Dublin Literary Award (the world's largest monetary literary prize for a single work of fiction published in English, €100,000). Out Stealing Horses was named one of the 10 best books of the year in the 9 December 2007 issue of the New York Times Book Review.

Petterson is a trained librarian. He has worked as a bookstore clerk, translator and literary critic before becoming a full-time writer. He cites Knut Hamsun and Raymond Carver among his influences.

Petterson's works have been translated into almost 50 languages.