Mari Eder (née Laukkanen; born 9 November 1987) is a Finnish former biathlete and cross-country skier. Eder competed in the 2010 Winter Olympics for Finland. Her best performance was 43rd in the individual. She also finished 68th in the sprint. In February 2013, Eder's best performance in the Biathlon World Cup was 7th, as part of the mixed relay team at Kontiolahti in 2011/12. Her best overall finish in the Biathlon World Cup is 36th, in 2011/12. She scored her first World Cup podium finish with a third place in the first of two sprints at the Kontiolahti round of the 2013/14 season. Up to February 2017, her best performance at the Biathlon World Championships was fourth at Hochfilzen, in Austria, in 2017, in the women's individual competition over the normal distance. Her previous best was sixth, as part of the 2009 Finnish mixed relay team. Her previous best individual performance was 15th in the 2012 sprint. However, in March 2017, she won both the 7.5 km sprint and 10 km pursuit in Holmenkollen. In addition to biathlon, Eder has competed in cross-country skiing, mostly in sprints and other short races. She enjoyed particular success at the Under-23 level, finishing on the podium in the individual sprint at the Under-23 World Championships three times, taking third in the 2008 Championships in Malles Venosta, second in the 2009 event at Praz de Lys-Sommand, and taking the gold medal in 2010 in Hinterzarten. In the FIS Cross-Country World Cup, her best results have been fifth place in the individual sprint in Sochi in February 2013, and in the team sprint in Toblach in January 2017. She competed in the cross-country sprint at the 2014 Winter Olympics in Sochi, where she placed 15th.