Etna, originally named "Mill Village", is a small community within the town of Hanover, New Hampshire, United States.

Etna has a separate ZIP code 03750 from the rest of Hanover, as well as its own fire station, general store, ball field, playground, church, and library with adjacent conserved land and bird sanctuary.

The Appalachian Trail passes roughly one mile north of the village before it turns northeastward to cross Moose Mountain on its way to Lyme.

Etna was the site of the 2001 Dartmouth College murders, as professors Half and Susanne Zantop were killed in their home.

The Etna Post Office was formerly located adjacent to the General Store, but it moved west across Mink Brook in the early 2000s.