Sienna Rose Miller (born December 28, 1981) is a BAFTA nominated American-born English actress, model, and fashion designer, best known for her roles in Alfie, Factory Girl, and The Edge of Love.

Miller was born in New York City on December 28, 1981 and moved with her family to London, England when she was a year old. She went to Francis Holland Junior School, from when she was 4 to 11. She attended Heathfield St Mary's School, a boarding school in Ascot, Berkshire and later studied for a year at the Lee Strasberg Institute in New York City.

Her father Edward Miller is an American banker turned Chinese art dealer. Her South African mother, Josefina "Jo" Miller, ran Lee Strasberg's acting academy in London and was once David Bowie's secretary.