| Official Name: | Walnut Township, Adair County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Adair |
| Area Total Km2: | 92.34 |
| Area Land Km2: | 92.07 |
| Area Water Km2: | 0.27 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.65 |
| Area Land Sq Mi: | 35.55 |
| Area Water Sq Mi: | 0.1 |
| Population As Of: | 2010 |
| Population Total: | 176 |
| Population Density Km2: | 1.9 |
| Population Density Sq Mi: | 5.0 |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Footnotes: | [1] |
| Elevation M: | 392 |
| Elevation Ft: | 1286 |
| Coordinates: | 41.4608°N -94.53°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-94389[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468881 |
Walnut Township is one of seventeen townships in Adair County, Iowa, USA. At the 2010 census, its population was 176.[3]
Walnut Township covers an area of 35.65sqmi and contains no incorporated settlements. According to the USGS, it contains four cemeteries: Abandoned Timber, Canby, Oakwood and Saint Josephs.