Jeff Lindsay is the pen name of an American crime writer, Jeffry P. Freundlich, who lives in Cape Coral, Florida with his wife, author Hilary Hemingway, daughter of Leicester Hemingway, Ernest Hemingways brother.

Lindsay is best known for writing the Dexter series of novels. Many of his earlier published works include his wife as a co-author. Time Blender was written with Michael Dorn. He graduated from Middlebury College, Vermont, in 1975.

The first book in the series, Darkly Dreaming Dexter, was included on the original nomination list for the Mystery Writers of Americas Edgar Awards in the Best First Novel category. However, it was dropped from the list after the group learned that Lindsay had put out several books in the 1990s under another pen name, Jeffrey P. Lindsay. A TV series called Dexter is currently airing on the US cable network Showtime, the storyline based on the series of books by the same name until season two, in which the TV series begins heavily deviating from the source material.