| Official Name: | Eel Township |
| Settlement Type: | Township |
| Mapsize: | 290px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Cass |
| Government Type: | Indiana township |
| Area Total Km2: | 25.33 |
| Area Land Km2: | 24.2 |
| Area Water Km2: | 1.13 |
| Area Total Sq Mi: | 9.78 |
| Area Land Sq Mi: | 9.34 |
| Area Water Sq Mi: | 0.44 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 18571 |
| Population Density Km2: | auto |
| Elevation Footnotes: | [2] |
| Elevation M: | 193 |
| Elevation Ft: | 633 |
| Coordinates: | 40.7539°N -86.3564°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 46947[3] |
| Area Code: | 574 |
| Blank Name: | FIPS code |
| Blank Info: | 18-20494[4] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453272 |
Eel Township is one of fourteen townships in Cass County, Indiana. As of the 2020 census, its population was 18,571 (down from 18,767 at 2010) and contained 8,028 housing units.
Eel Township covers an area of 9.78sqmi and lies partly between the Eel River and the Wabash River; the former joins the latter within Logansport (the county seat). According to the USGS, it contains one cemetery, Mount Hope.