Sacha Noam Baron Cohen (born 13 October 1971) is an English actor, comedian, and writer most noted for his comic characters Ali G (an inner city youth chav from suburban Staines), Borat Sagdiyev (a misogynistic, antisemitic Kazakh reporter), and Brüno (a flamboyantly homosexual Austrian fashion reporter). In his routine, he typically conducts interviews with respected figures while posing as one of his characters for comedic effect. Those he interviews ostensibly believe that the interviews are sincere and legitimate. Sacha Baron Cohen's work has been recognized 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, he announced that because the public had become too familiar with the characters, he would retire Borat and Ali G.

Sacha Baron Cohen was born in England, the youngest of three sons in an Orthodox Jewish family. His mother, Daniella (née Weiser), is a schoolteacher who was born in Israel. His father, Gerald Baron Cohen, was originally from Wales. Baron Cohen's paternal grandfather was born in Pontypridd, Wales, and his maternal grandmother, who now lives in Haifa, Israel, was a ballet dancer from Germany. His paternal great grandfather was born in Kaunas, Lithuania. His brother Erran Baron Cohen, a composer and trumpet player, contributed to the Borat film with the song "O Kazakhstan". Sacha Baron Cohen's cousin is Simon Baron-Cohen, a professor in the study of autism spectrum disorders, at Cambridge University.