Erik Karlsson (born May 31, 1990) is a Swedish professional ice hockey defenceman, currently playing for the Ottawa Senators of the National Hockey League (NHL). He was selected 15th overall by the Senators in the 2008 NHL Entry Draft.
Karlsson made his Elitserien debut for Frölunda HC on March 1, 2008, recording 8:48 of ice time during a sold out home game in Scandinavium, against league leaders HV71. Karlsson scored the game winning goal, assisted by Tomi Kallio and Magnus Kahnberg, with a slapshot off a faceoff, in overtime during a man advantage. The win secured a playoff berth for Frölunda with three games remaining of the regular season.
Karlsson finished the season with Frölunda's J20 team playing in the J20 SuperElit playoffs, where Frölunda took home the Anton Cup when they won two to one in games against Brynäs IF in the Swedish Junior Ice Hockey Championship final.