南蛇藤（学名：Celastrus orbiculatus）为卫矛科南蛇藤属的植物。

藤状灌木；近圆形或宽椭圆形的叶子互生，有锯齿；夏季开花，腋生或顶生聚伞花序；近球形的蒴果裂开；种子有橙红色假种皮。

Celastrus orbiculatus is a woody vine of the Celastraceae family. It is commonly called Oriental bittersweet. Other common names include Chinese bittersweet, Asian bittersweet, Round-leaved bittersweet, and Asiatic bittersweet. Celastrus orbiculatus was introduced into North America in 1879, and is considered to be an invasive species in eastern North America. It closely resembles the native North American species, Celastrus scandens, with which it will readily hybridize.