Robert Clark Gregg Jr. (born April 2, 1962) is an American actor, director, and screenwriter. He is best known for portraying Phil Coulson in films and television series set in the Marvel Cinematic Universe from 2008 to 2021. Gregg also voiced Coulson in the animated television series Ultimate Spider-Man (2012–2017) and the video games Lego Marvel Super Heroes (2013), Marvel Heroes (2013), and Lego Marvel's Avengers (2016).

Gregg is also known for his role as FBI Special Agent Mike Casper on the NBC political drama series The West Wing (2001–2004) and as Richard, the ex-husband of Christine Campbell, in the CBS sitcom The New Adventures of Old Christine (2006–2010).