Scarlett Johansson was born in New York City. Her father, Karsten Johansson, is a Danish-born architect, and her paternal grandfather, Ejner Johansson, was a screenwriter and director. Her mother, Melanie Sloan, a producer, comes from a Jewish family in the Bronx. Johansson's parents met in Denmark, where her mother lived with Johansson's maternal grandmother, Dorothy, a former bookkeeper and schoolteacher. Johansson has an older sister, Vanessa, who is also an actress; an older brother, Adrian; a twin brother, Hunter, also an actor; and a half-brother, Christian, from her father's re-marriage.
Scarlett Johansson grew up in a household with "little money" with a mother who was a "film buff".Johansson began her theater training by attending and graduating from Professional Children's School in Manhattan in 2002.
