Mathew William Phelps is an American crime writer and investigative journalist, podcaster, and TV Presenter. He is the author of 39 fact-based nonfiction (true crime) books, 2 thrillers, and four history books, including co-authoring Failures of the Presidents with Thomas J. Craughwell.

He has written for the Providence Journal, Hartford Courant and New London Day, and consulted on the first season of the Showtime series Dexter.

Beginning in January 2012, he produced and hosted, with criminal profiler John Kelly, the Investigation Discovery series Dark Minds on the Investigation Discovery channel.