Bath is a village in Mason County, Illinois, United States.

[3] Bath is in southwestern Mason County, on a low bluff overlooking the Illinois River valley to the west.

Illinois Route 78 passes through the village center as Oak Street, leading northeast (upriver) 9 miles (14 km) to Havana, the county seat, and south 10 miles (16 km) to Chandlerville.

According to the U.S. Census Bureau, Bath has a total area of 0.36 square miles (0.93 km2), all land.

Bath is host to the annual midsummer Redneck Fishing Tournament.