甜根子草（学名：Saccharum spontaneum）为禾本科甘蔗属下的一个种。

Saccharum spontaneum (wild sugarcane, Kans grass, Hindi:काँस kām̥s, Odia:କାଶତଣ୍ଡି kāśataṇḍi, Assamese:কঁহুৱা, খাগৰী kahuwa, khagori) is a grass native to the Indian Subcontinent. It is a perennial grass, growing up to three meters in height, with spreading rhizomatous roots.