The 2015 Tokyo Marathon was the ninth edition of the annual marathon race in Tokyo, Japan and was held on Sunday, 22 February. An IAAF Gold Label Road Race, it was the first World Marathon Majors event to be held that year and represented the third occasion that the Tokyo race was part of the elite-level marathon series.

Helah Kiprop Jelagat is a Kenyan professional long-distance runner who competes in the half marathon and marathon. Her personal bests for the events are 1:07:39 minutes and 2:21:27 hours, respectively.