| Official Name: | Walnut Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Kansas |
| Subdivision Type2: | County |
| Subdivision Name2: | Jewell |
| Area Total Km2: | 102.21 |
| Area Land Km2: | 102.14 |
| Area Water Km2: | 0.07 |
| Area Total Sq Mi: | 39.46 |
| Area Land Sq Mi: | 39.44 |
| Area Water Sq Mi: | 0.03 |
| Area Water Percent: | 0.07 |
| Population As Of: | 2000 |
| Population Total: | 80 |
| Population Density Km2: | 0.8 |
| Population Density Sq Mi: | 2 |
| Elevation M: | 554 |
| Elevation Ft: | 1818 |
| Coordinates: | 39.9578°N -98.3308°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0471850 |
Walnut Township is a township in Jewell County, Kansas, United States. As of the 2000 census, its population was 80.
Walnut Township covers an area of 39.46 square miles (102.21 square kilometers); of this, 0.03 square miles (0.07 square kilometers) or 0.07 percent is water.