Mervi Väisänen (born Mervi Pesu ;[1] born 2 May 1973) is a Finnish ski-orienteering and mountain bike orienteering competitor.

She won a bronze medal in the long distance at the 2002 World Ski Orienteering Championships in Borovetz.

[2] She won a silver medal at the 2002 World MTB Orienteering Championships, after finishing seven seconds behind gold medalist Laure Coupat.

[3] She won a bronze medal in the middle distance at the 2015 World Ski Orienteering Championships, behind Milka Reponen and Marjut Turunen.

This biographical article about a Finnish orienteer is a stub.