Benjamin Géza Affleck (born August 15, 1972) is an American actor and filmmaker. His accolades include two Academy Awards, two BAFTA Awards, and three Golden Globes. Affleck began his career as a child when he starred in the PBS educational series The Voyage of the Mimi (1984–1988). He later appeared in the independent comedy Dazed and Confused (1993) and several Kevin Smith comedies, including Chasing Amy (1997).

Affleck gained wider recognition when he and Matt Damon won the Academy Award for Best Original Screenplay for writing Good Will Hunting (1997), which they also starred in. He established himself as a leading man in studio films, including the disaster film Armageddon (1998), the action crime thriller Reindeer Games (2000), the war drama Pearl Harbor (2001), and the thriller The Sum of All Fears (2002). After a career downturn, Affleck made a comeback by portraying George Reeves in the biopic Hollywoodland (2006), winning the Volpi Cup for Best Actor.

His directorial debut, Gone Baby Gone (2007), which he also co-wrote, was well received. He then directed and starred in the crime drama The Town (2010) and the political thriller Argo (2012), both of which were critical and commercial successes. For the latter, Affleck won the BAFTA Award for Best Director, and the BAFTA and Academy Award for Best Picture. Affleck then starred in the psychological thriller Gone Girl (2014) and played the superhero Batman in the DC Extended Universe (2016–2023). He starred in the thriller The Accountant (2016) and the sports drama The Way Back (2020). Affleck had supporting roles in the dramas The Last Duel (2021), The Tender Bar (2021) and Air (2023), the third of which he also directed.

Affleck is the co-founder of the Eastern Congo Initiative, a grantmaking and advocacy-based nonprofit organization. He is a supporter of the Democratic Party. Affleck and Damon are co-owners of the production company Artists Equity and were also co-owners of Pearl Street Films.

Affleck was born Benjamin Géza Affleck-Boldt on August 15, 1972, in Berkeley, California. His family moved to Massachusetts when he was three, living in Falmouth, where his brother Casey was born, before settling in Cambridge. His mother, Christopher Anne "Chris" Boldt, was a Harvard-educated elementary school teacher. His father, Timothy Byers Affleck, was an aspiring playwright who was "mostly unemployed". He worked sporadically as a carpenter, auto mechanic, bookie, electrician, bartender, and janitor at Harvard. In the mid-1960s, he had been an actor and stage manager with the Theater Company of Boston.

During Affleck's childhood, his father had a self-described "severe, chronic problem with alcoholism", and Affleck has recalled him drinking "all day ... every day". His father was "very difficult", and Affleck felt a sense of "relief" at the age of 11 when his parents divorced, and his father exited the family home. His father continued to drink heavily and eventually became homeless, spending two years living on the streets of Cambridge. When Affleck was 16, his father entered a rehabilitation facility in Indio, California. He lived at the facility for 12 years to maintain his sobriety and worked there as an addiction counselor.

Affleck was raised in a politically active, liberal household. He and his brother, Casey, were surrounded by people who worked in the arts; the boys regularly attended theater performances with their mother and were encouraged to make their own home movies. David Wheeler, a family friend, later remembered Affleck as a "very bright and intensely curious" child. The brothers auditioned for roles in local commercials and film productions because of their mother's friendship with a Cambridge-area casting director, and Affleck first acted professionally at the age of seven. His mother saved his wages in a college trust fund and hoped her son would ultimately become a teacher, worrying that acting was an insecure and "frivolous" profession. When Affleck was 13, he filmed a children's television program in Mexico. He learned to speak Spanish during a year spent traveling around the country with his mother and brother.

As a Cambridge Rindge and Latin high school student, Affleck acted in theater productions and was inspired by drama teacher Gerry Speca. He became close friends with fellow student Matt Damon, whom he had known since the age of eight. Although Damon was two years older, the pair had "identical interests" and both wanted to pursue acting careers. They traveled to New York together for acting auditions and saved money for train and airline tickets in a joint bank account. While Affleck had high SAT scores, he was largely an unfocused student with poor attendance. He spent a few months studying Spanish at the University of Vermont, chosen because of its proximity to his then-girlfriend, but he left after fracturing his hip while playing basketball. At 18, Affleck moved to Los Angeles, studying Middle Eastern affairs at Occidental College for a year and a half.