Keiyo South Constituency
Keiyo South is an electoral constituency in Kenya. It is one of four constituencies of Elgeyo-Marakwet County. The constituency has 6 wards, all of which elect a Member of County Assembly for Elgeyo Marakwet County which sits in the county Headquarters, Iten. The wards are namely: Metkei, Kabiemit, Chepkorio, Soy South and Kaptarakwa. The constituency was established for the 1969 elections, one of two constituencies of the former Keiyo District.
Members of Parliament
| Elections | MP | Party | Notes |
| 1969 | Stanley Kurgat | KANU | One-party system |
| 1974 | Stanley Kurgat | KANU | One-party system |
| 1979 | Nicholas Biwott | KANU | One-party system |
| 1983 | Nicholas Biwott | KANU | One-party system. |
| 1988 | Nicholas Biwott | KANU | One-party system. |
| 1992 | Nicholas Biwott | KANU | |
| 1997 | Nicholas Biwott | KANU | |
| 2002 | Nicholas Biwott | KANU | |
| 2007 | Jackson Kiptanui | ODM | |
| 2013 | Jackson Kiptanui | URP | |
| 2017 | Daniel Rono | Jubilee | |
| 2022 | Gideon Kimaiyo | UDA |