| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Laenna 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: | 35.07 |
| Area Land Sq Mi: | 35.05 |
| Area Water Sq Mi: | 0.02 |
| Area Water Percent: | 0.06 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 16.7 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 562 |
| Blank Name: | FIPS code |
| Blank Info: | 17-107-40624 |
Laenna Township is located in Logan County, Illinois. As of the 2010 census, its population was 584 and it contained 282 housing units.[2]
According to the 2010 census, the township has a total area of, of which (or 99.94%) is land and (or 0.06%) is water.[2]
The township includes the geographical center of the State of Illinois, a small monument to which has been erected at 40°3.157'N 89°11.087'W (40.05259,-89.18482), in a park southeast of Melvin Street and East Olive Street in the village of Chestnut.