| Official Name: | Grant Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Kansas |
| Subdivision Type2: | County |
| Subdivision Name2: | Decatur |
| Area Total Km2: | 92.25 |
| Area Land Km2: | 92.19 |
| Area Water Km2: | 0.07 |
| Area Total Sq Mi: | 35.62 |
| Area Land Sq Mi: | 35.59 |
| Area Water Sq Mi: | 0.03 |
| Area Water Percent: | 0.08 |
| Population As Of: | 2000 |
| Population Total: | 31 |
| Population Density Km2: | 0.3 |
| Population Density Sq Mi: | 0.9 |
| Elevation M: | 723 |
| Elevation Ft: | 2372 |
| Coordinates: | 39.9675°N -100.22°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0470936 |
Grant Township is a township in Decatur County, Kansas, USA. As of the 2000 census, its population was 31.
Grant Township covers an area of 35.62sqmi and contains no incorporated settlements.
The stream of Spring Branch runs through this township.