蒺藜草属（学名：Cenchrus）是禾本科下的一个属，为一年生或有时多年生草本植物。该属共有约25种，分布于热带及温带地区。

Cenchrus is a widespread genus of plants in the grass family. Its species are native to many countries in Asia, Africa, Australia, the Americas, and various oceanic islands.

Common names include buffelgrasses, sandburs, and sand spur. Such names allude to the sharp, spine-covered burrs characterizing the inflorescences of the members of the genus.