Karl Emil Lindgren (born 4 May 1985 in Falun) is a Swedish professional mountain biker. Riding the sport for more than 15 years, Lindgren has won ten Swedish national championship titles in men's mountain biking (both under the men's junior and elite categories), and later represented his nation Sweden at the 2008 Summer Olympics. In 2009, Lindgren reached the summit of his mountain biking career by grabbing a first-place trophy and a yellow jersey at the Afxentia Stage Race, also known as the Sunshine Cup, in Cyprus. Lindgren currently trains and races professionally for the 2013 season on the Giant Pro XC Team, although he has appeared short stints on Bianchi, Full-Dynamix, De Brink-Ten Tusscher, and Rabobank cycling teams.

Lindgren qualified for the Swedish squad, along with his teammate and two-time Olympian Fredrik Kessiakoff, in the men's cross-country race at the 2008 Summer Olympics in Beijing by receiving one of the nation's two available berths from the Swedish Cycling Federation (Swedish: Svenska Cykelförbundet, SCF) and the Union Cycliste Internationale (UCI), based on his best performance at the World Cup series, World and European Championships, and Mountain Biking World Series. Lindgren could not upgrade a much stellar ride to complete a 4.8-km sturdy, treacherous cross-country course, as he decided to end his course with only two laps left and a thirty-eighth-place finish because of bike problems.

He also competes in cyclo-cross, having won the Swedish National Cyclo-Cross Championships in 2010 and 2020.