Etna, New Hampshire

{{Use mdy dates|date=July 2023}}

{{Infobox settlement

| official_name = Etna, New Hampshire

| settlement_type = Unincorporated community

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| image_skyline = EtnaNH_PO.jpg

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| image_caption = Etna Post Office

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| pushpin_map = New Hampshire#USA

| pushpin_label = Etna

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| subdivision_type = Country

| subdivision_name = United States

| subdivision_type1 = State

| subdivision_name1 = New Hampshire

| subdivision_type2 = County

| subdivision_name2 = Grafton

| subdivision_type3 = Town

| subdivision_name3 = Hanover

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| timezone = Eastern (EST)

| utc_offset = -5

| timezone_DST = EDT

| utc_offset_DST = -4

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| elevation_ft = 764

| coordinates = {{coord|43|41|34|N|72|13|18|W|region:US-NH|display=inline,title}}

| postal_code_type = ZIP code

| postal_code = 03750

| area_code = 603

| blank_name = GNIS feature ID

| blank_info = 866813{{cite gnis|866813|Etna}}

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Etna, originally named "Mill Village", is a small community within the town of Hanover, New Hampshire, United States. It is located in southwestern Grafton County, approximately {{Convert|3|mi|km}} east of Hanover's downtown and {{Convert|2.5|mi|km|abbr=on}} south of the village of Hanover Center, on Mink Brook. 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 population within Etna's ZIP Code area was 870 at the 2010 census.{{cite web| url=https://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_SF1/SF1DP1/8600000US03750| title=Profile of General Population and Housing Characteristics: 2010 Census Summary File 1 (DP-1), ZCTA5 03750| publisher=U.S. Census Bureau| work=American FactFinder| access-date=October 22, 2018| archive-url=https://archive.today/20200213112619/https://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_SF1/SF1DP1/8600000US03750| archive-date=February 13, 2020| url-status=dead}}

Commerce revolves around the Etna General Store and the Etna Post Office. 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 can be accessed from NH Rt. 120 via Greensboro Road or Great Hollow Road (Etna Road, north of the Lebanon exit (number 18) from Interstate 89), or from Hanover via Trescott Road (E. Wheelock Street).

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