| Official Name: | Mendon Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Clayton |
| Area Total Km2: | 87.29 |
| Area Land Km2: | 85.15 |
| Area Water Km2: | 2.14 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 33.7 |
| Area Land Sq Mi: | 32.88 |
| Area Water Sq Mi: | 0.82 |
| Area Water Percent: | 2.45 |
| Population As Of: | 2000 |
| Population Total: | 1890 |
| Population Density Km2: | 22.2 |
| Population Density Sq Mi: | 57.5 |
| Elevation M: | 253 |
| Elevation Ft: | 830 |
| Coordinates: | 43.0192°N -91.2036°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468374 |
Mendon Township is a township in Clayton County, Iowa, United States. As of the 2000 census, its population was 1,890.
Mendon Township covers an area of 33.7sqmi and contains two incorporated settlements: Marquette and McGregor. According to the USGS, it contains ten cemeteries: Baylis, Buell Park, Eastman, First Evangelical Lutheran, Knapp, Moody, Pleasant Grove, Point Ann, Saint Marys Catholic and Walton.
The streams of Bloody Run and North Cedar Creek run through this township.