Caleb Casey McGuire Affleck-Boldt (born August 12, 1975) is an American actor and director. He is the younger brother of Ben Affleck.
He played Morgan O'Mally in Good Will Hunting, Virgil Malloy in the Ocean's Trilogy and Patrick Kenzie in Gone Baby Gone. He portrayed Robert Ford in The Assassination of Jesse James by the Coward Robert Ford which he received an Academy Award nomination for Best Supporting Actor.
In 2017, Affleck won the Academy Award for Best Actor for his role in Manchester by the Sea.