Sean Justin Penn (born August 17, 1960) is an American actor and filmmaker. He is known for his intense leading man roles in film. His accolades include three Academy Awards, a Golden Globe Award, and nominations for three British Academy Film Awards, an Emmy Award, and a Grammy Award. He received the Honorary César in 2015 and the Bob Hope Humanitarian Award in 2022.

Penn made his feature film debut in the drama Taps (1981), before taking roles in Fast Times at Ridgemont High (1982), Bad Boys (1983), and At Close Range (1986). He has won the Academy Award for Best Actor twice, for playing a grieving father in Mystic River (2003) and the gay rights activist Harvey Milk in Milk (2008). He won the Academy Award for Best Supporting Actor for playing the ruthless military officer Colonel Steven J. Lockjaw in One Battle After Another (2025). He was Oscar-nominated for Dead Man Walking (1995), Sweet and Lowdown (1999), and I Am Sam (2001). He also acted in Casualties of War (1989), State of Grace (1990), Carlito's Way (1993), The Game(1997), The Thin Red Line (1998), Hurlyburly (1998), 21 Grams (2003), Fair Game (2010), The Tree of Life (2011), Licorice Pizza (2021) and Daddio (2023).