Bill Istvan Günther Skarsgård (Swedish: [ˈbɪlːˈskɑ̌ːʂɡoːɖ]; born 9 August 1990) is a Swedish actor, model, producer, and director. He is best known for portraying Pennywise in the horror films It (2017) and It Chapter Two (2019) and the television series It: Welcome to Derry (2025–present) and Count Orlok in Nosferatu (2024). Skarsgård's roles as monsters and other non-human characters have led media sources to describe him as a creature actor. He has received multiple awards and nominations, including a Satellite Award and a Berlinale Award. Films in which he has appeared have grossed over $3.3 billion worldwide.

Skarsgård started his career as a child actor, starring in White Water Fury (2000), alongside his brother Alexander. After pursuing an education at Södra Latin, he landed his first major role in Simple Simon (2010). He gained international recognition in the main role in Hemlock Grove (2013–2015). His first major American role was in the Robert Schwentke-directed dystopian The Divergent Series: Allegiant (2016).