Nyambaria High School is a secondary school located in Nyamira County, Kenya. It is a Seventh-day Adventist school that was established in 1966 as a small school, with few dormitories, but has grown considerably since then. Nyambaria School now has a student population of 2200. It is part of the Seventh-day Adventist Church's worldwide educational system.

Presently, the school has twenty one classrooms, three laboratories, a computer lab, a capacity library, a woodwork shop, 14 dormitories and much else besides. It is located in a hilly neighbourhood nicknamed "London" for its affluence.

Among the school's athletic facilities are: football, handball, rugby, and volleyball pitches, basketball and tennis courts. The school has an active record in co-curricular activities having reached the nationals levels in drama, rugby, music, science congress and indoor games. The students are also involved in contests, symposia, discussions and excursions.

Since the inception of the school, it has been served by the following principals:

1. Charles Mokaya (1966–1969)

2. Daniel Mosomi (1970–1973)

3. Musa Mokano (1974–1989)

4. Lazarus Mainye (1990–2003)

5. Robinson Otwori (2004–2016)

6. Gerald Orina (2016-2018)

7. Boaz Owino (2018–2022)

8. Mr. Onyari (2022 - To date)