Linda Edna Cardellini (born June 25, 1975) is an American actress. In television, she is known for her leading roles in the teen drama Freaks and Geeks (1999–2000), the medical drama ER (2003–09), the drama thriller Bloodline (2015–17), and the tragicomedy Dead to Me (2019–present), the latter of which earned her a nomination for the Primetime Emmy Award for Outstanding Lead Actress in a Comedy Series. She also guest starred in the period drama Mad Men (2013–15), for which she received a Primetime Emmy Award nomination. Her voice work includes the animated series Scooby-Doo! Mystery Incorporated (2010–13), Regular Show (2012–15), Gravity Falls (2012–16), and Sanjay and Craig (2013–16).

In film, Cardellini is best known for her portrayal of Velma Dinkley in Scooby-Doo (2002) and its sequel Scooby-Doo 2: Monsters Unleashed (2004), and her supporting roles in Legally Blonde (2001), Brokeback Mountain (2005), Grandma’s Boy (2006), Kill the Irishman (2011), Avengers: Age of Ultron (2015), The Founder (2016), Green Book, A Simple Favor (both 2018), and Avengers: Endgame (2019). She also starred in the drama Return (2011), earning an Independent Spirit Award for Best Female Lead nomination, the comedies Daddy's Home (2015) and Daddy's Home 2 (2017), and the horror film The Curse of La Llorona (2019).