| Official Name: | Smithfield 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: | 35.09 |
| Area Land Sq Mi: | 34.99 |
| Area Water Sq Mi: | 0.1 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 1662 |
| Population Density Sq Mi: | 46.1 |
| Elevation Footnotes: | [2] |
| Elevation M: | 285 |
| Elevation Ft: | 935 |
| Coordinates: | 41.4836°N -85.025°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-70200[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453854 |
Smithfield Township is one of fifteen townships in DeKalb County, Indiana. As of the 2020 census, its population was 1,662, up from 1,613 at the 2010 census.[4] It contained 718 housing units.
Smithfield Township was named for Isaac B. Smith, a pioneer settler.[5]
According to the 2010 census, the township has a total area of, of which (or 99.72%) is land and (or 0.28%) is water.[4] Cedar Lake is in this township.
The township contains two cemeteries: Barkers Chapel and Cedar Lake.