Kjell Tommy Christoffer Sundgren (born 31 July 1989) is a Swedish curler. He currently plays lead for the Swedish national team, skipped by Niklas Edin. The World Curling Federation's historical records rank Sundgren as one of the most successful curlers of all time, both in the medals that he has received and his lifetime performance in individual championships.[1][2] He is one of only three curlers in history to have won both the Olympic Gold medal and five World Championship gold medals. In 2022, he surpassed the previous record holders for World Men's Curling Championship medals, winning his fifth gold medal, in addition to his and European Men's Curling Championship (5 gold, 2 silver), placing him third of all time on both lists behind his teammates Edin and Oskar Eriksson.[3][4] He also has reached thirty-five playoffs at Grand Slam of Curling events, including winning three Grand Slam tournaments and the Pinty's Cup as part of Team Niklas Edin, the first non-Canadian men's team to do so. In 2017, Sundgren and his teammates also became the first men's team in history to win four consecutive European Men's Curling Championships. In 2021, he and his teammates became the first men's team in history to win four consecutive World Men's Curling Championships.