Mang'u High School is a top-tier Kenyan National Boys' High School established in 1925. The school is located in Kiambu County along the Nairobi-Thika Highway, six kilometres from Thika, Kenya. A long-time academic giant, Mang'u High School has maintained impressive performances at the Kenya Certificate of Secondary Education and ranks on the top list of National Schools. The school produced the leading KCSE candidate in the 2013 exams. During the 2020 KCSE examinations, it emerged third with a mean score of 10.28. The school produced 42 A's, 134 A-'s, and 106 B+'s to make a strong comeback in the national examinations.