Mari Fasting (born 1 March 1985)[1] is a Norwegian orienteering competitor[2] and ski mountaineer.

She represents the club NTNUI of Trondheim, and is related to the ski mountaineer Ola Berger.

[4] Fasting participated at the 2006 World Orienteering Championships in Aarhus, where she finished 6th in the middle distance.

At the 2008 European Orienteering Championships in Ventspils she finished 4th in the relay event with the Norwegian national team.

She competed at the 2013 World Orienteering Championships, and won a gold medal in the relay with the Norwegian team, together with Heidi Bagstevold and Anne Margrethe Hausken Nordberg.