Altha is a small town in Calhoun County, Florida, United States. The population was 506 at the 2000 census. As of 2004, the population recorded by the U.S. Census Bureau is 507.
Altha is located at 30°34′18″N 85°7′39″W / 30.57167°N 85.1275°W / 30.57167; -85.1275 (30.571710, -85.127533).
According to the United States Census Bureau, the town has a total area of 1.5 square miles (3.8 km²), of which 1.4 square miles (3.7 km²) is land and 0.04 square miles (0.1 km²) (2.72%) is water.