Viola Cheptoo Lagat (born 13 March 1989) is a Kenyan middle-distance runner specialising in the 1500 metres.

She competed at the 2015 World Championships, 2016 World Indoor Championships and 2016 Summer Olympics.

She comes from a family of runners that includes sisters Mary Chepkemboi[3] and Everlyne Lagat[4] as well as brothers Robert Cheseret and Olympic medalist Bernard Lagat.

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