黄石县（Yellowstone County, Montana）是美国蒙大拿州东南部的一个县。面积6,861平方公里。根据美国2000年人口普查，共有人口129,352。县治比灵斯 (Billings)。

成立于1909年3月9日。县名来自今日称为黄石河两岸黄色的石头。

Yellowstone County is a county located in the State of Montana. As of the 2010 census, the population was 147,972, and a 2014 estimate put the population at 155,634. It is the most populous county in Montana. Its county seat is Billings. Yellowstone County is named for the Yellowstone River which roughly bisects the county from southwest to northeast. The river in turn was named after the yellow Sandstone cliffs in what is now Yellowstone County.