| Official Name: | Walnut Township |
| Settlement Type: | Township |
| Unit Pref: | imperial |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Iowa |
| Subdivision Type2: | County |
| Subdivision Name2: | Fremont |
| Area Total Km2: | 65.26 |
| Area Land Km2: | 65.26 |
| Area Water Km2: | 0 |
| Area Total Sq Mi: | 25.2 |
| Area Land Sq Mi: | 25.2 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2010 |
| Population Footnotes: | [1] |
| Population Total: | 145 |
| Population Density Km2: | 2.2 |
| Population Density Sq Mi: | 5.8 |
| Elevation M: | 338 |
| Elevation Ft: | 1109 |
| Coordinates: | 40.7831°N -95.4489°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 51601, 51639 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468884 |
Walnut Township is one of thirteen townships in Fremont County, Iowa, United States. As of the 2010 census, its population was 145 and it contained 66 housing units.[1]
As of the 2010 census, Walnut Township covered an area of, all land.[1]