Kitui County is a county in the former Eastern Province of Kenya. Its capital and largest town is Kitui, although Mwingi is also another major urban centre. The county has a population of 1,136,187 (2019 census) and an area of 30,430 km2.It lies between latitudes 0°10 South and 3°0 South and longitudes 37°50 East and 39°0 East.
Kitui County shares its borders with seven counties; Tharaka-Nithi and Meru to the north, Embu to the northwest, Machakos and Makueni to the west, Tana River to the east and southeast, and Taita-Taveta to the south.