Armand Douglas Hammer was born in Los Angeles, California, to Dru Ann (Mobley) and Michael Armand Hammer, a businessman. His great-grandfather,Armand Hammer, was a prominent tycoon and philanthropist who ran the company Occidental Petroleum for many decades. Armie's ancestry includes Russian-Jewish, English, Scots-Irish, and German. He has a younger brother,Viktor Hammer (Armie and Viktor share the same first names as their great-grandfather and his brother). His father is chairman and CEO of the Armand Hammer Foundation, where his mother is a board member. His parents also serve together on the boards of the Los Angeles Dream Center and Knoedler & Hammer Galleries in New York. In addition, his father is a member of the board of trustees forOral Roberts University, and his mother, a former bank loan officer, teaches Bible study in Los Angeles.

His family moved to Dallas, Texas, when he was approaching school age. They moved to the Cayman Islands in 1993, where they stayed for 5 years. While here, Armie attended the Grace Christian Academy, a school that his father set up. They returned to Los Angeles when Armie was thirteen. He attended L.A. Baptist High School and Calvary Junior High School. He made his stage debut playing "Rooster Hannigan" in a 6th-grade production of "Annie". He left school in the 11th grade so that he could pursue acting. His parents were keen for him to continue his studies, so he took courses at Pasadena City College and UCLA.

He had various small parts, before being cast asBilly Graham inBilly: The Early Years (2008). His breakthrough role came when he played the "Winklevoss Twins" inThe Social Network (2010), in a dual role. He has since played "Clyde Tolson" inJ. Edgar (2011), "Prince Alcott" inMirror Mirror (2012), and starred in the title role, John Reid, in the 2013 version ofRôn Renjâ (2013), oppositeJohnny Depp as Tonto.

In 2015, Hammer starred withHenry Cavill in the spy thrillerThe Man from U.N.C.L.E. (2015), playing Russian spy Illya Kuryakin and American agent Napoleon Solo, respectively. His 2016 films include the historical dramaThe Birth of a Nation (2016), the thrillersNocturnal Animals (2016) andMine (2016), and the crime dramaFree Fire (2016). In 2017, he voiced Jackson Storm in the CGI sequelCars: Crossroad (2017), and starred as Oliver, an American scholar, in the dramaKimi no namae de Boku wo yonde (2017), oppositeTimothée Chalamet. For the role, Armie received his first Golden Globe nomination, for Best Supporting Actor.

In 2018, he played David in the dramaHotel Mumbai (2018), and starred as real life taxation law expert Martin D. Ginsburg inOn the Basis of Sex (2018), a biopic of Martin's wife, Supreme Court JusticeRuth Bader Ginsburg. More recently, he headlined the unusual horror filmWounds (2019) and was Maxim de Winter in the drama-thrillerRebecca (2020).

Armie was married to actress, model, and television personalityElizabeth Chambers in 2010. They announced their divorce in July 2020. They have two children, a boy and a girl.

- IMDb mini biography by: Kad