Bromus arizonicus is a species of brome grass known by the common name Arizona brome. It is native to the Southwestern United States, California, and Baja California, where it grows in many types of grassy valley and desert habitat. It is an annual grass growing 40 to 90 centimeters tall with an open, branching inflorescence. The spikelets are flat and hairy and have awns up to 1.5 centimeters long.