Tianjin Nankai High School is a college-preparatory high school in Tianjin, China. This is the original Nankai High School, and it is often referred to as Nankai High School in Tianjin to differentiate it from Chongqing Nankai Middle School, its sister school in Chongqing. Nankai is notable as one of the first modern secondary schools in China, and boasts several of the most notable men in modern Chinese history as its alumni. The main campus is located at 22 Nankai 4th Rd in Nankai District. The other two campuses are in Sino-Singapore Tianjin Eco-city and Haihe Jiaoyu Yuanqu, Tianjin.

Chang Po-ling was a Chinese educator who, with Yan Xiu, founded Nankai University and the Nankai system of schools.