Bill Istvan Gunther Skarsgard is a Swedish actor, who debuted alongside his father Stellan Skarsgard as a child artist in White Water Fury (2000). His notable works include Simple Simon (2010), Behind Blue Skies (2010), Simon & the Oaks (2011), Anna Karenina (2012), Allegiant (2016) and Battlecreek (2017), Atomic Blonde (2017), It (2017), Deadpool 2 (2018) and It: Chapter 2 (2019).

He has also starred in TV series like Arn: The Knight Templar (2010) and Hemlock Grove (2013-2015).