Gao Gan (pronunciationⓘ) (died 206), courtesy name Yuancai, was a minor warlord who lived during the late Eastern Han dynasty of China.
He was also a maternal nephew of the warlord Yuan Shao, who controlled most of the territories in northern China from the 190s to his death in 202.
After Yuan Shao's death in 202, Gao Gan gained support from Guo Yuan and the southern Xiongnu leader Huchuquan to counter Cao Cao's advances into northern China.
Gao Gan fled from Hu Pass, leaving behind his subordinates Xia Zhao (夏昭) and Deng Sheng (鄧升) to defend the pass, and went to seek help from the Xiongnu.
After the Xiongnu refused to help him, Gao Gan headed south towards Jing Province to seek aid from Liu Biao, the provincial governor.