Laurence van Cott Niven (born April 30, 1938 Los Angeles, California) is a US science fiction author. Perhaps his best-known work is Ringworld (1970), which received Hugo, Locus, Ditmar, and Nebula awards. His work is primarily hard science fiction, using big science concepts and theoretical physics.

It also often includes elements of detective fiction and adventure stories. His fantasy includes The Magic Goes Away series, rational fantasy dealing with magic as a non-renewable resource. Niven also writes humorous stories; one series is collected in The Flight of the Horse.

Niven is a great-grandson of oil tycoon Edward L. Doheny, an important figure in the Teapot Dome scandal of the 1920s. He briefly attended the California Institute of Technology and graduated with a Bachelor of Arts in mathematics (with a minor in psychology) from Washburn University, Topeka, Kansas, in 1962.

He did a year of graduate work in mathematics at the University of California at Los Angeles. He has since lived in Los Angeles suburbs, including Chatsworth and Tarzana, as a full-time writer. He married Marilyn Joyce "Fuzzy Pink" Wisowaty, herself a well-known Science Fiction and Regency literature fan, on September 6, 1969.

Niven is the author of numerous science fiction short stories and novels, beginning with his 1964 story "The Coldest Place". In this story, the coldest place concerned is the dark side of Mercury, which at the time the story was written was thought to be tidally locked with the Sun (it was found to rotate in a 2:3 resonance just months before the story was published).

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