Nyamira County is a county in the former Nyanza Province of Kenya. It was formerly part of Kisii County when Kisii County was a district, and is sometimes called North Kisii County. It is one of the counties in the Lake region economic cluster.

It borders Kisii, Homabay, Kericho and Bomet Counties. Nyamira town is the largest and currently the headquarter of the county and harbours all the county offices.

The county has 5 subcounties namely: Nyamira South, Nyamira North, Borabu, Masaba North and Manga sub counties.

Further, the county is divided into 20 wards namely: Bogichora, Bosamaro, Bonyamatuta, Township, Bokeira, Bomwagamo, Ekerenyo, Magwagwa, Itibo, Kiabonyoru, Esise, Mekenene, Nyansiongo, Rigoma, Gachuba, Gesima, Magombo, Kemera and Manga Wards.