Andrew W. Marlowe (sometimes Andrew Marlowe) is an American screenwriter and producer. He is best known for being the creator, executive producer, and writer of  CBS' The Equalizer (2021-), the CBS show Take Two (2018), and the ABC show Castle (2009-2016). He also wrote the screenplays for Air Force One, End of Days, and Hollow Man.

He won the Nicholl Fellowship award for screenwriting for his script The Lehigh Pirates. Apogee, a space-based adventure he wrote soon after, sold for $500,000.

He is purportedly the ghostwriter (or co-writer) of Heat Wave, a mystery novel published September 28, 2009, attributed to the fictional Richard Castle—the title character of the Castle TV series; the novel itself is a plot element in the show.