Machakos County is a county of Kenya. Its capital is Machakos. Its largest town is Machakos, the country's first administrative headquarters. The county had a population of 1,098,584 as of 2009. The county borders Nairobi and Kiambu counties to the west, Embu to the north, Kitui to the east, Makueni to the south, Kajiado to the south west, and Muranga and Kirinyaga to the north west.
The office of the governor of Machakos was created on 27 March 2013. Alfred Mutua, the incumbent, is the inaugural holder of the office.