Tehuacana is a town near the Tehuacana Hills in Limestone County, Texas, United States. The population was 283 at the 2010 census. From 1869 until 1902, the town was home to Trinity University.

Limestone County is a county in the U.S. state of Texas. As of the 2020 census, its population was 22,146. Its county seat is Groesbeck. The county was created in 1846.