Etna is an unincorporated town in Etna-Troy Township, Whitley County, in the U.S. state of Indiana.
Etna was platted in 1849. The community was named after Etna, Ohio, the native home of a first settler.
A post office was established at Etna in 1851. The name of the post office was changed to Hecla in 1861, and operated under this name until 1904.