Óscar Isaac Hernández Estrada (born March 9, 1979) is an American actor. Recognized for his versatility, he has been credited with breaking stereotypes about Latino characters in Hollywood. He was named the best actor of his generation by Vanity Fair in 2017 and one of the 25 greatest actors of the 21st century by The New York Times in 2020. His accolades include a Golden Globe Award and a nomination for a Primetime Emmy Award. In 2016, he featured on Time's list of the 100 most influential people in the world.

Born in Guatemala, Isaac moved with his family to the United States as an infant. As a teenager, he joined a punk band, acted in plays and made his film debut in a minor role. A graduate of the Juilliard School, Isaac was a character actor in films for much of the 2000s. His first major role was that of Joseph in the biblical drama The Nativity Story (2006), and he won an AACTA Award for Best Actor in a Supporting Role for portraying political leader José Ramos-Horta in the Australian film Balibo (2009). After gaining recognition for playing supporting parts in Robin Hood (2010) and Drive (2011), Isaac had his breakthrough with the eponymous role of a singer in the musical drama Inside Llewyn Davis (2013), which earned him a Golden Globe nomination.