Mang'u High School is a Kenyan Roman Catholic National High School established in 1925, located in Kiambu County along the Nairobi-Thika Highway six kilometres (3.7 mi) from Thika, Kenya. Mang'u High School is ranked among the top schools nationwide in Kenya Certificate of Secondary Education and has many eminent alumni including one Kenyan president, several vice presidents, a Central Bank of Kenya governor and a former Cardinal.

Thika is an industrial town and commerce hub in Kiambu County, Kenya, lying on the A2 road 42 kilometres (26 mi), northeast of Nairobi, near the confluence of the Thika and Chania Rivers. Although Thika town is administratively in Kiambu County, the greater Thika area comprising residential areas such as Bendor estate, Maporomoko, Thika Greens, Thika Golden Pearl, Bahati Ridge, and Thika Sports Club, among others, are within Murang'a County. Thika has a population of 279,429 which is growing rapidly, as is the entire greater Nairobi area. Its elevation is approximately 1,631 metres (5,351 ft).