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Bishop Gatimu Ngandu Girls High School popularly known as BeeGee or BG was founded in the 1960s by the late Bishop Caesar Gatimu and was run by the Comboni mission in Karatina, Nyeri County, Kenya. It took the name "Ngandu Girls' High School" for the area where it was situated, and the name was later changed to honour its founder. The late Sister Nazarena Zonta and her deputy ran the school until 1983. Lay principals (or headmistresses) have headed the school since.
The school's Old Girls' group, (ONGA - Old Ngandu Girls Association) is uniting with alumnae to help revamp the school and collect donations. The group visits the school to talk to the student body and offer them career advice and leadership. It has five streams from form 2 to 4 except form 1 which has seven steams and has 15 dormitories.
The school motto is "Unity is Strength".
The current school principal is Virginia Wahome.
- "Bishop Gatimu Girls: Where Mashirima Kapombe, Amani wore grass-green skirts". Standard Digital News. Retrieved 2020-05-28.
- The Standard, October 30, 2009: "Amani's Road to the Top".