Kees van Beijnum (born 21 March 1954 in Amsterdam) is a Dutch writer. He grew up in Amsterdam, where his mother had a bar near the Zeedijk. Before he became a writer, he was a journalist. He made his debut as a novelist in 1991 with Over het IJ, a non-fiction novel about a murder case in Amsterdam. The novel De ordening, published in 1998, was based on the life of Florentine Rost van Tonningen (1914-2007), a Dutch national-socialist who stood by her beliefs until her death. The book was adapted to film and was nominated for a Golden Calf award in 2003.