| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Aetna Township |
| Image Map1: | Map of Illinois highlighting Logan County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Logan County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Logan |
| Leader Title: | Supervisor |
| Established Title: | Established |
| Established Date: | November 7, 1865 |
| Area Total Sq Mi: | 34.66 |
| Area Land Sq Mi: | 34.66 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 15.4 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 524 |
| Blank Name: | FIPS code |
| Blank Info: | 17-107-00360 |
Aetna Township is located in Logan County, Illinois. As of the 2010 census, its population was 535 and it contained 228 housing units.[2] Chestnut, Illinois and Bakerville, Illinois are the only communities in the township.
Aetna Township most likely derives its name from Mount Etna.[3]
According to the 2010 census, the township has a total area of, all land.[2]
According to the 2020 United States census, Aetna Township has a population of 476 in 212 houses. The employment rate was 50.7%.[4]