Sacha Noam Baron Cohen (born 13 October 1971) is an English comedian, actor, and writer. He is most widely known for his portrayal of three unorthodox fictional characters, Ali G, Borat, and Brüno. In his routines, Baron Cohen's characters interact with unsuspecting people who do not realize they are being set up for comic situations and self-revealing ridicule.

Baron Cohen's work has been recognised with several Emmy nominations, an Oscar nomination for Best Adapted Screenplay, a BAFTA award, and a Golden Globe for Best Actor for his work in the feature film Borat: Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan. After the release of the film Borat, Baron Cohen stated that because the public had become too familiar with the characters, he would retire Borat and Ali G. Similarly, after the release of Brüno, he has stated he would also retire the title character.

Baron Cohen was born in Hammersmith, West London, England. His mother, Daniella (née Weiser), was born in Israel, while his father, Gerald, was originally from Pontypridd, Wales. Sacha is the second of three sons, with elder brother Erran and younger brother Amnon. His family is Jewish. His paternal grandfather was born in Pontypridd, and his maternal grandmother, who lives in Haifa, Israel, trained as a ballet dancer in Germany. Erran is a composer and has worked on several of his films. Internationally renowned autism researcher Simon Baron-Cohen is his cousin.