Kiambu County is home to several C1 senior schools under Kenya's Competency-Based Education (CBE) system. These institutions are among the country's highest-ranked public senior secondary schools and are recognised for academic excellence, modern learning facilities, and diverse learning pathways.
Many of these schools were formerly National Schools, while others attained C1 status under the Ministry of Education's current senior school classification framework.
The county also has several Special Needs Education (SNE) institutions classified as C1 schools.

C1 Senior Schools in Kiambu County
The following are the C1 senior schools in Kiambu County:
- Alliance Girls' High School
- Alliance High School
- Kambui Girls' High School
- Kiambu High School
- Limuru Girls' School
- Loreto High School Limuru
- Mang'u High School
- Our Lady of Mt. Carmel Maryhill Girls
- PCEA Kambui School for the Hearing Impaired
- Precious Blood Kagwe Girls Secondary School
- S.A. High School for the Blind
- S.A. Joytown Secondary School for the Physically Handicapped
- St. Anne's Secondary School Lioki
- St. Francis Girls' High School (Mang'u)
- Thika High School
About C1 Senior Schools
C1 senior schools are classified by the Ministry of Education as top-tier public secondary schools. They generally offer:
- Multiple CBC learning pathways.
- Modern classrooms, laboratories and learning facilities.
- Strong academic and co-curricular programmes.
- Qualified teaching staff.
- Boarding or day school options, depending on the institution.
Students are placed in these schools through the Ministry of Education's senior school placement process.
Choosing a C1 Senior School
Before selecting a school, learners and parents should consider:
- Available CBC pathways and subject combinations.
- School location.
- Boarding or day school arrangements.
- Co-curricular activities.
- Student support services and learning facilities.