What country is William Karlsson from?

William Karlsson is from Sweden.

Lars William Karlsson is a Swedish professional ice hockey player who was born in Märsta, Sweden, on January 8, 1993. He plays forward and is known by the nickname “Wild Bill.” His Swedish nationality and birthplace make Sweden the standard answer to this question.

Karlsson began his professional career in Sweden with HV71 before entering the NHL. The Anaheim Ducks selected him 53rd overall in the second round of the 2011 NHL Entry Draft. He later played for the Ducks and the Columbus Blue Jackets before becoming a key player for the expansion Vegas Golden Knights.

Karlsson’s first season with Vegas in 2017–18 was a breakout campaign. He scored 43 goals, helping the Golden Knights reach the Stanley Cup Final in their inaugural season. He also represented Sweden internationally, including at the 2017 IIHF World Championship, where Sweden won the gold medal.

The question asks where Karlsson is from, not which team he plays for. His NHL club has changed during his career, but his country of origin remains Sweden.