Dean Ray Koontz is an American writer.

He is best-known for writing many successful novels that could broadly be described as suspense thrillers, but which also frequently incorporate elements of horror, science fiction, mystery, and satire. Several of his books have appeared on the New York Times Bestseller List, with ten hardcovers and fourteen paperbacks hitting number one. Early in his career, Koontz wrote under an array of pen names, but since the 1980s has written mostly under his own name.