Karl Oskar Anton Karlsson (born 11 September 1993) is a Swedish professional golfer who has played on the European Tour.

He joined the Nordic Golf League in 2014, and came close to claim a maiden title when he lost a playoff at the 2015 Danish PGA Championship.

[6] Karlsson was one of the 2018 European Tour Qualifying School graduates and moved back onto Europe's top tier once again.

On the 2019 European Tour he was runner-up at the Commercial Bank Qatar Masters, two strokes behind Justin Harding, and finished ranked 136th.

[7] Again playing on the Challenge Tour, Karlsson clinched his maiden victory at the Sunshine Tour co-sanctioned RAM Cape Town Open in 2020,[8] where he maintained the momentum from a bogey-free eight-under-par third round of 64 as he reeled off six birdies in seven holes from the 7th hole to move to the top of the leaderboard.