水牛草（学名：Cenchrus ciliaris）为禾本科蒺藜草属下的一个种。

Cenchrus ciliaris (buffel-grass or African foxtail grass; syn. Pennisetum ciliare (L.) Link) is a species of grass native to most of Africa, southern Asia (east to India), southern Iran, and the extreme south of Europe (Sicily).

It is a perennial grass growing to 50 cm tall. The leaves are linear, 3–25 cm long and 4–10 mm wide. The flowers are produced in a panicle 2–14 cm long and 1–2.6 cm wide.