Michael David Shapiro[2] (/ʃəˈpaɪroʊ/ shə-PY-roh[3]) (born December 29, 1965)[4] is an American actor.

He is best known for voicing the G-Man and Barney Calhoun in the Half-Life video game series.

Michael Shapiro is most famous for voicing Barney Calhoun and the G-Man in all of the characters' appearances in the Half-Life series.

Other video games in which he is credited as "Mike Shapiro" are Blood II: The Chosen, Grand Theft Auto: Liberty City Stories and Torin's Passage.

In 2007, Shapiro co-directed a TV pilot, Family Values, starring Rob Riggle.