Younger sister of Mary-Kate and Ashley Olsen who emerged as a talented horror film actress in Mary Martha May Marlene and Silent House. She played Elle Brody in the 2014 film Godzilla and Scarlet Witch in the 2015 blockbuster Avengers: Age of Ultron.
She played the lead actress in the 2013 film Oldboy, a remake of the cult 2003 South Korean film of the same name.
She co-starred with Josh Radnor in the 2012 indie feature Liberal Arts.
She took ballet and singing lessons as a child and studied acting at New York University's Tisch School of the Arts and the Atlantic Theater Company.
From 2012 to 2015, she dated actor Boyd Holbrook, whom she met on the set of the film Very Good Girls. She then began dating Tom Hiddleston.
- The meaning of the name Olsen: Son Of Olaf