马拉松县（Marathon County, Wisconsin）是美国威斯康辛州中部的一个县。面积4,082平方公里。根据美国2010年人口普查，共有人口134,063人。县治沃索 (Wausau)。

马拉松县成立于1807年。县名来自希腊的马拉松。

目前美国所出产的花旗参有多达95%来自马拉松县。

Marathon County is a county located in the U.S. state of Wisconsin. As of the 2010 census, the population was 134,063. Its county seat is Wausau. It was founded in 1850, created from a portion of Portage County. At that time the county stretched to the northern border with the upper Michigan peninsula. It is named after the battlefield at Marathon, Greece.