| Official Name: | Spencer Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | DeKalb |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 18.01 |
| Area Land Sq Mi: | 17.95 |
| Area Water Sq Mi: | 0.07 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 1198 |
| Population Density Sq Mi: | 68.7 |
| Elevation Footnotes: | [2] |
| Elevation M: | 243 |
| Elevation Ft: | 797 |
| Coordinates: | 41.2922°N -84.9044°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-71918[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453859 |
Spencer Township is one of fifteen townships in DeKalb County, Indiana. As of the 2020 census, its population was 1,198, down from 1,233 at the 2010 census.[4] It contained 452 housing units.
The Spencerville Covered Bridge was added to the National Register of Historic Places in 1981.
According to the 2010 census, the township has a total area of, of which (or 99.67%) is land and (or 0.39%) is water.[4]
The township contains two cemeteries: Riverside and White City.