Paul Edward Valentine Giamatti (/ˌdʒiːəˈmɑːti/JEE-ə-MAH-tee; born June 6, 1967) is an American actor. His accolades include a Primetime Emmy Award, three Golden Globes, and nominations for two Academy Awards and a British Academy Film Award.

After studying acting at the Yale School of Drama, he performed in numerous theatrical productions. Giamatti debuted on Broadway, portraying Ezra Chater in the Tom Stoppard play Arcadia (1995). Later that year, he played the Rev. Donald "Streaky" Bacon in the David Hare play Racing Demon (1995). He returned to theatre in the revivals of Anton Chekhov's Three Sisters (1997) and Eugene O'Neill's The Iceman Cometh (1999).