明尼哈哈县 (Minnehaha County, South Dakota)是美国南达科他州东南部的一个县，东邻明尼苏达州和爱阿华州。面积2,107平方公里。根据美国2000年人口普查，共有人口148,281人，是全州人口最多的县。县治苏瀑 (Sioux Falls)。

成立于1830年。县名来自印第安语，意思是「瀑布」。

Minnehaha County is a county located in the state of South Dakota. As of the 2010 census, the population was 169,468, making it the most populous county in South Dakota. Its county seat is Sioux Falls. The county was created in 1862 and organized in 1868. It received its name from the Sioux word Mnihaha, meaning "rapid water," or "waterfall" (often also incorrectly translated as "laughing water").