Thomas H. Cook (born September 19, 1947) is an American author, whose 1996 novel The Chatham School Affair received an Edgar Award from the Mystery Writers of America.

He studied at the Georgia State College, completed a postgraduate degree in American history at Hunter College, and earned a master's in philosophy from Columbia University. From 1978 to 1981, he taught English and history at Dekalb Community College in Georgia and wrote book reviews for the Atlanta Magazine from 1978 to 1982, when he became a full-time writer.

His first novel, Blood Innocents, was started during his student years and published in 1980. A film adaptation of one of his books, Evidence of Blood, was released in 1997. Six of his novels were nominated for awards, including Red Leaves in 2006, which was also nominated for the Anthony Award, and won the Barry Award and the Martin Beck Award.

He lives with his family in Cape Cod and New York City. He has been praised by critics for his attention to psychology and the lyrical nature of his prose. Cook has published more than 30 critically acclaimed fiction books, including works of true crime.