Hebius septemlineatus, the Tengchong keelback snake, is a species of snake of the family Colubridae. It is endemic to western Yunnan, China. The vernacular name refers to its type locality, Tengchong.
Males measure NaN1NaN1 and females NaN1NaN1 in snout–vent length. The tail is NaN1NaN1 and NaN1NaN1 in males and females, respectively.