| Official Name: | Walnut Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Dallas |
| Area Total Km2: | 94.86 |
| Area Land Km2: | 94.85 |
| Area Water Km2: | 0.01 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 36.62 |
| Area Land Sq Mi: | 36.62 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0.01 |
| Population As Of: | 2000 |
| Population Total: | 8074 |
| Population Density Km2: | 85.1 |
| Population Density Sq Mi: | 220.5 |
| Elevation M: | 310 |
| Elevation Ft: | 1017 |
| Coordinates: | 41.6375°N -93.8786°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468883 |
Walnut Township is a township in Dallas County, Iowa, United States. As of the 2000 census, its population was 8,074.
Walnut Township covers an area of 36.62sqmi and contains one incorporated settlement, Waukee. According to the USGS, it contains two cemeteries: Hoff and Waukee.
The stream of Little Walnut Creek runs through this township.
Walnut Township contains one airport or landing strip, Robel Field.