Date of Birth: 
About Mary Chemweno
- Mary Chemweno Koskei (2 February 1959) is a former Kenyan middle distance runner who specialised in 400 m, 800 m and 1500 m events.
- She won the gold medal in the inaugural 1979 African Championships in 800 metres, and another gold medal six years later in 1500 metres at the 1985 edition.
- She is also a three-time Kenyan national champion, having won both the 400 and 800 metres events in 1981 as well as the 800 m event again in 1986.
- Mid-career, in the early 1980s, she married long-distance runner Kipsubai Koskei.
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