Kianyaga High is a boys-only public school in Raimu Sub-location, Baragwi location in Gichugu constituency. The school was established in the 1960s through fundraising by the local community. Although the idea was mocked by some people, the elders persisted to see the establishment of the first A-level educational institution in Kirinyaga. Today, the institution is a force to reckon with.
The school acquired the nickname Kalahari (the Southern Africa desert)due to the harsh conditions that were part of school life. The first dormitories were mud-walled. They were phased out in the 1980s.