Kitondo Boys' Secondary School, an Extra-County institution, was founded in 1970 as a coeducational Harambee Secondary School with sponsorship from the A.I.C Church. It transitioned into a Government Aided school in 1982. In 1987, a decision was made to establish a separate girls' school, which is now known as Kisau Girls Secondary School. This transformation led Kitondo Boys' Secondary School to become an exclusive boys' boarding school. The school has a strong track record of excelling in national examinations, as exemplified by its impressive mean score of 9.0 and 40 students achieving A grades in 2005. Kitondo Boys' Secondary School maintains a diverse student body, admitting students from various socio-cultural backgrounds and from all counties across Kenya.

Since its establishment in 1970, Kitondo School has played a significant role in advancing education. The school has witnessed a substantial number of students pass through its halls, and these alumni have left an indelible mark, not only within the country but also on a global scale. Guided by its motto, "Determined to serve and committed to excellence," Kitondo School has consistently embodied these principles. The school's vision, which aims to become a leading transformative boys' institution producing well-rounded young men ready to contribute to society, is indeed heading in the right direction. In our ever-evolving world, the current generation of youth remains vital for instigating meaningful and positive changes in society, and Kitondo School plays a pivotal role in shaping these future leaders. To realize this vision, Kitondo School is dedicated to providing a conducive learning environment that fosters the acquisition of knowledge, skills, and positive behaviors. Achieving this mission necessitates the collaboration of all stakeholders involved.