Elizabeth Chase Olsen (born February 16, 1989) is an American actress. Born in Sherman Oaks, California, Olsen began acting at age four. She starred in her debut film role in the thriller Martha Marcy May Marlene in 2011, for which she was acclaimed and nominated for a Critics' Choice Movie Award among other accolades, followed by a role in the horror film Silent House. Olsen received a BAFTA Rising Star Award nomination and graduated from New York University two years later.

Olsen gained worldwide recognition for her portrayal of Wanda Maximoff / the Scarlet Witch in the Marvel Cinematic Universe media franchise, starring in the superhero films Avengers: Age of Ultron (2015), Captain America: Civil War (2016), Avengers: Infinity War (2018), Avengers: Endgame (2019), and Doctor Strange in the Multiverse of Madness (2022), as well as the miniseries WandaVision (2021). Her performance in WandaVision garnered her nominations for a Primetime Emmy Award, a Golden Globe Award and a Critics’ Choice Television Award.

Outside of her work with Marvel, Olsen starred in the monster film Godzilla (2014), the mystery film Wind River (2017), the dramedy Ingrid Goes West (2017), the miniseries Love & Death (2023), the family drama His Three Daughters (2023) and the sci-fi thriller The Assessment (2024). Olsen’s performance in Love & Death received critical acclaim and earned her another nomination for a Golden Globe Award. She executive produced and starred in the drama series Sorry for Your Loss (2018–2019), earning a Critics' Choice Television Award nomination for her role as a widow.