Loren D. Estleman (born September 15, 1952 in Ann Arbor, Michigan) is an American writer of detective and Western fiction. He writes with a manual typewriter.
Estelman graduated from Eastern Michigan University in 1974 with a BA degree in English and Journalism. In 2002, Eastern Michigan University presented him with an honorary doctorate in humane letters. He married the mystery writer Deborah Morgan in 1993.
He is most famous for his novels about P.I. Amos Walker. Other series characters include Old West marshal Page Murdock and hitman Peter Macklin. He has also written a series of novels about the history of crime in Detroit (also the setting of his Walker books.) His non-series works include Bloody Season, a fictional recreation of the gunfight at the O.K. Corral, and several novels and stories featuring Sherlock Holmes.