Per Jonas Karlsson (born 2 January 1986) is a Swedish former professional footballer who played as a defender.

[4] On 15 July 2020 he made his 396th appearance for AIK in a 2020 Allsvenskan 1-0 win against IK Sirius, surpassing Daniel Tjernström at 395 games and setting a club record.

[7] Karlsson was a part of the Sweden U21 squad that advanced to the semifinals of the 2009 UEFA European Under-21 Championship that took place on Swedish home soil, but did not play.

[8] He was called up to a 2014 FIFA World Cup qualifier against Germany as a replacement for Jonas Olsson, but did not play.

[8] In May 2019, Karlsson was called up to Sweden's UEFA Euro 2020 qualifiers against Malta and Spain, but did not play.