Son of actor Stellan Skarsgård.
Brother of Alexander Skarsgård, Sam Skarsgård, Bill Skarsgård, Eija Skarsgård and Valter Skarsgård.
His godfather is Peter Stormare.
2007: Named as one of European films' Shooting Stars by European Film Promotion.
Best friends with fellow Swedish actor Matias Varela since childhood.
Favorite actor is Gary Oldman.
Favorite actresses are Juliette Binoche and Isabelle Huppert.
Gustaf's second name Orm literally means "snake" in Swedish.
He has played the king of Sweden in two separate ages; first the 17th century king Karl XI (Charles XI) and then the 13th century king Knut Eriksson (Canute I).
Ex-brother-in-law of Sara Alström.