| Official Name: | Denison Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Crawford |
| Area Total Km2: | 91.66 |
| Area Land Km2: | 91.56 |
| Area Water Km2: | 0.1 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.39 |
| Area Land Sq Mi: | 35.35 |
| Area Water Sq Mi: | 0.04 |
| Area Water Percent: | 0.11 |
| Population As Of: | 2000 |
| Population Total: | 7757 |
| Population Density Km2: | 84.7 |
| Population Density Sq Mi: | 219.4 |
| Elevation M: | 385 |
| Elevation Ft: | 1263 |
| Coordinates: | 41.9906°N -95.3814°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0467702 |
Denison Township is a township in Crawford County, Iowa, United States. As of the 2000 census, its population was 7,757.
Denison Township covers an area of 35.39sqmi and contains one incorporated settlement, Denison (the county seat). According to the USGS, it contains five cemeteries: Crawford County Home, Crawford Heights Memorial, Oakland, Saint Rose of Lima and Zion.
The streams of Coon Creek, East Boyer River and Willow Creek run through this township.
Denison Township contains one airport, Denison Municipal Airport.