Karl-Johan Anton Johnsson (born 28 January 1990) is a Swedish professional footballer who plays as a goalkeeper for Ligue 1 club Strasbourg.

Starting off his career in Sweden with Halmstads BK, Johnsson has gone on to represent NEC, Randers, and Guingamp before signing with Copenhagen in 2019.

A full international for the Sweden national team since 2012, he was a squad player for his country at the 2018 FIFA World Cup as well as UEFA Euro 2020.

[3][4] As Conny Johansson retired and Marcus Sahlman left for Tromsø IL, Karl-Johan was made second choice goalkeeper for the 2009 season.

[10] In the 2018–19 Coupe de la Ligue quarter-finals, Johnsson played the full 90 minutes as Guingamp eliminated PSG and thereby ended their 43 games-long unbeaten streak.