| Official Name: | Marion Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Clayton |
| Area Total Km2: | 92.89 |
| Area Land Km2: | 92.89 |
| Area Water Km2: | 0 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.87 |
| Area Land Sq Mi: | 35.87 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2000 |
| Population Total: | 389 |
| Population Density Km2: | 4.2 |
| Population Density Sq Mi: | 10.8 |
| Elevation M: | 292 |
| Elevation Ft: | 958 |
| Coordinates: | 42.9525°N -91.5464°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468349 |
Marion Township is a township in Clayton County, Iowa, United States. As of the 2000 census, its population was 389.
Marion Township covers an area of 35.87sqmi and contains no incorporated settlements. According to the USGS, it contains five cemeteries: Apostolic, Cook, Houg, Marion Lutheran and Mork.
The streams of Deer Creek and Sand Creek run through this township.