钝稃野大麦（学名：Hordeum spontaneum）为禾本科大麦属下的一个种。

Hordeum spontaneum, commonly known as wild barley or spontaneous barley, is the wild form of the grass in the family Poaceae that gave rise to the cereal barley (Hordeum vulgare). Domestication is thought to have occurred on two occasions, first about ten thousand years ago in the Fertile Crescent and again later, several thousand kilometres further east.