Aetna is a hamlet in southern Alberta, Canada within Cardston County, located 2 kilometres (1.2 mi) east of Highway 2, approximately 70 kilometres (43 mi) southwest of Lethbridge.
The town was named in 1893 after Mount Etna.
As a designated place in the 2016 Census of Population conducted by Statistics Canada, Aetna recorded a population of 113 living in 31 of its 33 total private dwellings, a change of 50.7% from its 2011 population of 75. With a land area of 0.95 km2 (0.37 sq mi), it had a population density of 118.9/km2 (308.1/sq mi) in 2016.
Coordinates: 49°08′02″N 113°14′24″W / 49.13389°N 113.24000°W