Kirinyaga County is a county in the former Central Province of Kenya. Its capital is Kerugoya and its largest town is Wanguru.In 2019, the county had a population of 610,411 and an area of 1,478.1 km2. The county is bordered to the east and south by Embu County, to the south by a tiny part of Machakos County, to the southwest by Murang'a County and to the northwest by Nyeri County.

Kirinyaga county lies between 1158 and 5199 metres above sea level; its highest point is the summit of Mount Kenya.