Louisa (originally named Louisa Court House) is a town in Louisa County, Virginia, United States. The population was 1,401 at the 2000 census. It is the county seat of Louisa County.
Louisa is located at 38°1′27″N 78°0′6″W / 38.02417°N 78.00167°W / 38.02417; -78.00167 (38.024057, -78.001584).
According to the United States Census Bureau, the town has a total area of 1.8 square miles (4.7 km²), of which, 1.8 square miles (4.7 km²) of it is land and 0.55% is water.