Sadie Elizabeth Sink (born April 16, 2002) is an American actress. She began acting at age seven in local theatre productions and played the title role in Annie (2012–14) and young Elizabeth II in The Audience (2015) on Broadway. In 2016, she made her film debut in the biographical sports drama Chuck.

Sink had her breakthrough portraying Max Mayfield in the Netflix science fiction series Stranger Things (2017–present) and received critical acclaim for her performance in its fourth season. In 2021, she appeared in the horror film trilogy Fear Street and played the lead role in Taylor Swift's short film All Too Well. Sink has since starred in Darren Aronofsky's psychological drama The Whale (2022), for which she received a Critics' Choice Movie Award nomination.

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