Kian Kok Middle School (Sekolah Menengah Kian Kok in Malay, 沙巴建国中学 in Chinese) is a Chinese independent high school located in Kota Kinabalu, Sabah, Malaysia.

Kian Kok Middle School was founded in Kota Kinabalu during the early 1963.

Students were forced to study in a temporary "campus" made up of several commercial offices that were leased by local businesses.

The first building of Kian Kok Middle School was finally completely in January 1965.

It was considered as the standard size of a Malaysian high school at that time.