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is a city in Washington County, Illinois, in the United States. As of the 2000 census, the city population was 3,147. It is the county seat of Washington County.
According to the United States Census Bureau, the city has a total area of 2.8 square miles (7.2 km²), of which, 2.7 square miles (6.9 km²) of it is land and 0.1 square miles (0.2 km²) of it (3.25%) is water.
Nashville is located on Nashville Creek, at the headwaters of Little Crooked Creek, which flows northwest into the Kaskaskia River. Just to the southeast of Nashville is the headwaters of Beaucoup Creek, which flows south into the Big Muddy River. Nashville is thus situated next to the Kaskaskia/Big Muddy divide.