William Jannert is a Swedish actor living in Skåne in southern Sweden. He plays Jon in the Netflix miniseries "Land of Sin" (Synden, 2026), created and directed by Peter Grönlund, which was nominated for the Kristallen award for best TV series. Among his previous works are young Mattias in the Viaplay miniseries "End of Summer" (2023), Elias in the feature film "Scapegoat" (2024), and Max in the SVT series "Celebration" (2021).

He grew up in a bilingual family and is a native speaker of Swedish and German, and also speaks fluent English. He is represented by Hammarström Agency in Stockholm.