Mark Greaney (born 1967) is an American novelist focusing on thriller. He is best known as Tom Clancy's collaborator on his final books during his lifetime, and for continuing the Jack Ryan character and the Tom Clancy universe following Clancy's death in 2013. He is also known for the Gray Man series of novels, which was produced by Netflix into a feature film.

Born in Memphis, Tennessee, he is the son of Ed Greaney, a presence at WMC-TV Memphis for over 50 years and the namesake for the station's current newsroom. Greaney has degrees in political science and international relations, which would later play a major part in his writing career.

Greaney previously worked as a waiter and bartender for ten years, then later in a surgical technology company, while working on two novels in his spare time. After finishing one of them, titled Goon Squad and was primarily about the aftermath of the Bosnian civil war, he gave the first 20 pages of his work to his favorite author Ralph Peters's agent, Scott Miller, in a book conference in September 2006. Miller liked the book but later did not go forward with it, saying that "it was unmarketable," according to Greaney. But he urged Greaney to write another one based from a character in Goon Squad named Court Gentry, which would later be The Gray Man. After finishing this novel, Miller agreed to represent him, and later found a publisher, Jove Books.

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