Keiyo District (also known as Elgeyo district or Elgeiyo) is a defunct administrative district in the former Rift Valley Province of Kenya. The district was formed in 1994, when Elgeyo/Marakwet-District was split into two - the other half was Marakwet District. Keiyo District had a population of 143.865 . Its capital was located in the Iten/Tambach town. In 2010, the districts were re-joined as Elgeyo-Marakwet County.
Local people are mostly of the Keiyo Tribe. Many famous Kenyan runners come from the district, including Saif Saaeed Shaheen (born Stephen Cherono), Vivian Cheruiyot and Lornah Kiplagat. The area is used by local and foreign athletes for high-altitude training.
Keiyo District has two local authorities:
|* 1999 census. Sources: , ,|
The district had two constituencies:
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