| Official Name: | Jefferson Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Clayton |
| Area Total Km2: | 148.83 |
| Area Land Km2: | 131.97 |
| Area Water Km2: | 16.86 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 57.47 |
| Area Land Sq Mi: | 50.96 |
| Area Water Sq Mi: | 6.51 |
| Area Water Percent: | 11.33 |
| Population As Of: | 2000 |
| Population Total: | 2721 |
| Population Density Km2: | 20.6 |
| Population Density Sq Mi: | 53.4 |
| Elevation M: | 274 |
| Elevation Ft: | 899 |
| Coordinates: | 42.7825°N -91.1333°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468132 |
Jefferson Township is a township in Clayton County, Iowa, United States. As of the 2000 census, its population was 2,721.
Jefferson Township covers an area of 57.47sqmi and contains one incorporated settlement, Guttenberg. According to the USGS, it contains nine cemeteries: Borcherding, Guttenberg, Lewis, Mount Olivet, Saint Johns, Saint Marys, Saint Michael, Saint Pauls and Stock School.
Frenchtown Lake is within this township. The streams of Buck Creek, Carlan Creek, Miners Creek, Price Branch and South Cedar Creek run through this township.
Jefferson Township contains three airports or landing strips: Abels Island Airport, GAA Private Airport and Walters Heliport.