Brett Matthews is an American writer of comics and TV shows. He was assistant to Joss Whedon on TV shows Buffy the Vampire Slayer, Angel and Firefly. He scripted the Firefly episode Heart of Gold. In 2004 he wrote the screenplay for the Direct to DVD animated movie The Chronicles of Riddick: Dark Fury.

In comics, Matthews has co-written the Serenity comic book prequel mini-series Those Left Behind and Better Days with Joss Whedon. He has also written Daredevil, Spider-Man and Wolverine comicbook specials for Marvel Comics. He just wrapped up his creatively acclaimed run on The Lone Ranger for Dynamite Entertainment.

Matthews received Hugo Award nominations for his script for "Heart of Gold" and in the Graphic Story category for Serenity: Better Days.