| Official Name: | South Branch Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Nebraska |
| Subdivision Type2: | County |
| Subdivision Name2: | Nance |
| Area Total Km2: | 92.55 |
| Area Land Km2: | 92.49 |
| Area Water Km2: | 0.06 |
| Area Total Sq Mi: | 35.73 |
| Area Land Sq Mi: | 35.71 |
| Area Water Sq Mi: | 0.02 |
| Area Water Percent: | 0.06 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 34 |
| Population Density Km2: | auto |
| Elevation M: | 572 |
| Elevation Ft: | 1877 |
| Coordinates: | 41.4353°N -98.2228°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0838258 |
South Branch Township is one of twelve townships in Nance County, Nebraska, United States. The population was 34 at the 2020 census. A 2021 estimate placed the township's population at 34.[1]