| Official Name: | Elsah Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Jersey County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Jersey County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Jersey |
| Established Title: | Established |
| Established Date: | November 5, 1878 |
| Area Total Sq Mi: | 26.42 |
| Area Land Sq Mi: | 23.79 |
| Area Water Sq Mi: | 2.63 |
| Area Water Percent: | 9.95 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 103.5 |
| Elevation M: | 140 |
| Elevation Ft: | 459 |
| Coordinates: | 38.9636°N -90.3272°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 62022, 62028, 62035, 62037 |
| Blank Name: | FIPS code |
| Blank Info: | 17-083-23789 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 2319 |
| Unit Pref: | Imperial |
Elsah Township is one of eleven townships in Jersey County, Illinois, United States. As of the 2010 census, its population was 2,462 and it contained 1,027 housing units.[2]
According to the 2010 census, the township has a total area of, of which (or 90.05%) is land and (or 9.95%) is water.[2]
The township contains these three cemeteries: Elsah, Saint Michaels and Wendle.