Bill Istvan Günther Skarsgård (Swedish pronunciation:  (listen); born 9 August 1990) is a Swedish actor, producer, director, writer, voice actor, and model. He is best known for portraying Pennywise the Dancing Clown in the supernatural horror films It (2017) and It Chapter Two (2019), based on Stephen King's novel of the same name.

Skarsgård has also appeared in the comedy Simple Simon (2010), the dystopian thriller The Divergent Series: Allegiant (2016), the espionage thriller Atomic Blonde (2017), the comedy-horror Villains (2019), the drama Nine Days (2020), the Marvel Cinematic Universe film Eternals (2021) and the horror film Barbarian (2022). He starred in the supernatural horror series Hemlock Grove (2013–2015) and the anthology horror series Castle Rock (2018–2019). He played the lead role in the Netflix series Clark (2022).

Early life
Skarsgård was born on 9 August 1990 in Vällingby, Sweden, the son of actor Stellan Skarsgård and doctor My Skarsgård. He has seven siblings: Alexander, Gustaf, Valter (all actors), as well as Sam, Eija, Ossian, and Kolbjörn. Ossian and Kolbjörn are half-brothers from Stellan Skarsgård's remarriage to Megan Everett.