Muhlenbergia alopecuroides, synonyms including Lycurus setosus, is a species of grass in the family Poaceae. It is native to the south western United States and northern Mexico, as well as to northern Argentina. It was first described by August Grisebach in 1874 as Lycurus alopecuroides. It is commonly known as the bristly wolfstail.
Muhlenbergia alopecuroides is a perennial mountain grass with a tufted habit. The erect stems have several nodes and grow from to in height and may have a few branches. The leaf blades are glabrous and grow up to long but only wide. They are rough or bristly and have a white midrib below. The flower panicles are to long and about wide. They are also bristly. It can be distinguished from the rather similar common wolfstail (Muhlenbergia phleoides) by the erect culms, longer ligules and differently shaped tips to the upper leaves.
Muhlenbergia alopecuroides grows at altitudes between and . It is found on arid, free draining land, on mesas and rocky slopes. It occurs in the Southwestern United States and in northern Mexico. A separate population occurs in northern Argentina.