Kirsten Melkevik Otterbu (née Melkevik May 29 May 1970) is a Norwegian long-distance runner who specializes in the marathon.

In the marathon event she finished 28th at the 2005 World Championships, 13th at the 2006 European Championships, 29th at the 2007 World Championships and 34th at the 2008 Olympic Games.

[1] She won the Stockholm Marathon in 2007.

[4] She was born in Øystese,[5] and represents the sports club IL Gular.

Melkevik received attention when she changed her legal name from Kirsten Melkevik Otterbu to Kirsten Marathon Melkevik in September 2010.