Mari Eder (née Laukkanen; born 9 November 1987) is a Finnish former biathlete and cross-country skier.

[3] 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.

[2] 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.

[4] 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.

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.