David Marshall Blough (born July 31, 1995) is an American professional football coach and former quarterback who is the offensive coordinator for the Washington Commanders of the National Football League (NFL). Blough played college football for the Purdue Boilermakers and played with the NFL's Cleveland Browns, Detroit Lions, Minnesota Vikings, and Arizona Cardinals. Blough began coaching in 2024 with the Commanders as an assistant quarterbacks coach and was promoted to offensive coordinator in 2026.