Moses Ndiema Masai (born 1 June 1986 in Kapsogom, Mount Elgon District) is a Kenyan runner who specializes in the 10,000 metres.

[2] Their father John Barasa Masai is also a former runner,[2] while Ben Jipcho, a legendary athlete, is their distant uncle.

[5] He took the World's Best 10K title at the 2010 race in Puerto Rico, scoring a new course record of 27:19 and picking up a bonus for his fast time.

[8] In spite of his low-profile in prior seasons, he gained a place on the Kenyan Olympic team by coming second at the 10,000 m trials at 2012 Prefontaine Classic.

He is not to be confused with another Kenyan runner named Moses Masai, known for running marathons and road races in Central Europe.