Etna is a town in the Scott Valley area of Siskiyou County, California, United States.

Originally named Rough and Ready, it was changed by statute in 1874 to Etna after the local flour mill (spelled Ætna/Aetna after Mount Ætna in Sicily).

[6] Etna is in Northern California near the Oregon border, located in Scott Valley near the CDP of Greenview, the city of Fort Jones, and the unincorporated community of Callahan.

Etna is located at the foot of the Marble Mountain Wilderness in the Siskiyou subrange of the Klamath (Cascades) Range and is an attraction for hikers, rafters, climbers and people who do all sorts of other outdoor activities.

According to the United States Census Bureau, the city has a total area of 0.8 square miles (2.1 km2), 99.88% of it land and 0.12% of it water.

At the 2000 census there were 781 people in 329 households, including 210 families, in the city.

There were 362 housing units at an average density of 458.8 per square mile (177.1/km2).

In the California State Legislature, Etna is in the 1st Senate District, represented by Republican Megan Dahle,[10] and the 1st Assembly District, represented by Republican Heather Hadwick.

[13] The Center for Traditionalist Orthodox Studies (established 1981) and the Metropolitan Cyprian Theological Library are located on the monastery grounds.