Mary Wacera Ngugi (born 17 December 1988) is a Kenyan long-distance runner who competes in road running events.

In a strong field featuring future world champions Florence Kiplagat and Bai Xue, she took the bronze medal.

This caused relationship issues as Wanjiru already had two children by Terezah Njeri, whom he had married in a traditional ceremony, but not a legal one.

Wanjiru fell off the upstairs balcony of his house and subsequently died due to the injuries he sustained in the fall.

His death was ruled as suicide, although many family members suggested he was murdered and police did not properly conduct a forensic investigation of the scene.

[3] At the start of 2014 she established herself among the top road runners by winning the World's Best 10K, defeating Gladys Cherono, Linet Masai and 2013 champion Joyce Chepkirui.