Etna (formerly Carthage) is an unincorporated community and census-designated place (CDP) in Licking County, Ohio, United States.

[5] Etna was originally called "Carthage", under which name it was laid out in 1832 when the National Road was being built to that point.

[7] A post office called Etna has been in operation since 1833.

Newark, the Licking county seat, is 20 miles (32 km) to the northeast.

According to the U.S. Census Bureau, the Etna CDP has a total area of 0.7 square miles (1.7 km2), of which 0.04 square miles (0.1 km2), or 0.65%, are water.