米苏拉县（Missoula County, Montana）是美国蒙大拿州西部的一个县，西南邻爱达荷州。面积6,781平方公里。根据美国2000年人口普查，共有人口95,802。县治米苏拉 (Missoula)。

成立于1865年2月2日，是该州第一批成立的县之一。县名来自扁头族 (Flathead，操萨利什语的印第安部落)的「m-i-sul-e-etiku」，意思是「令人恐惧或者伏击的地方」，指的是地狱门峡谷—他们在那里有时会被黑脚族 (Blackfeet)袭击。

Missoula County is a county located in the State of Montana. As of the 2010 census, the population was 109,426, making it the second-most populous county in Montana. Its county seat and largest city is Missoula. The county was founded in 1860.

Missoula County comprises the Missoula, MT Metropolitan Statistical Area.