| Office1: | President of Tsinghua University (Acting) |
| Term Start1: | 1918 |
| Term End1: | 1918 |
| Predecessor1: | Zhou Yichun |
| Successor1: | Zhang Yuquan |
| Office2: | President of Tsinghua University (Acting) |
| Term Start2: | 1913 |
| Term End2: | 1913 |
| Predecessor2: | Tang Guo'an |
| Successor2: | Zhou Yichun |
| Zhao Guocai | |
| Native Name: | 赵国材 |
| Native Name Lang: | zh |
| Birth Date: | 1879 |
| Birth Place: | Shanghai, Qing Empire |
| Death Place: | Shanghai, China |
| Party: | Chinese Communist Party |
| Alma Mater: | St. John's University, Shanghai Cornell University University of Wisconsin System |
Zhao Guocai (; 1879–1966) was a Chinese educator and diplomat.
Zhao was born in Shanghai in 1879. In 1906 he graduated from St. John's University, Shanghai. Zhao was sent abroad to study at the expense of the Qing dynasty. He studied politics at Cornell University and the University of Wisconsin. He returned to China in 1913 and that year became vice-president of Tsinghua University, after the President Tang Guo'an left, he acted as the acting president.[1] [2] In 1920, he was director of China's educational mission in Washington.
In 1966, Mao Zedong launched the Cultural Revolution, Zhao was mistreated and tortured by the Red Guards.