Karl Jesper Karlsson (born 25 July 1998) is a Swedish professional footballer who plays as an attacking midfielder or left winger for Serie A club Lecce on loan from Bologna, and the Sweden national team.

In the 79th minute he was replaced in instead of Akseli Pelvas, in the match Falkenbergs FF lost 2–0 to IFK Göteborg.

[9] Karlsson transferred from Falkenbergs FF to Swedish top flight IF Elfsborg on 2 December 2016 for a fee of €450,000.

[9] On 11 September 2020, Karlsson signed a five-year contract with Eredivisie club AZ Alkmaar.

[10][11] After arriving in Alkmaar, he made his debut on 4 October 2020 in a 4–4 draw against Sparta Rotterdam, in which he provided two assists.