| Official Name: | Marcy Township, Boone County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Boone |
| Area Total Km2: | 108.95 |
| Area Land Km2: | 108.37 |
| Area Water Km2: | 0.57 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 42.06 |
| Area Land Sq Mi: | 41.84 |
| Area Water Sq Mi: | 0.22 |
| Population As Of: | 2000 |
| Population Total: | 1137 |
| Population Density Km2: | 10.5 |
| Population Density Sq Mi: | 27.2 |
| Elevation Footnotes: | [1] |
| Elevation M: | 329 |
| Elevation Ft: | 1079 |
| Coordinates: | 41.9864°N -93.9797°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-92832[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468346 |
Marcy Township is one of seventeen townships in Boone County, Iowa, United States. As of the 2000 census, its population was 1,137.
Marcy Township was organized in 1858.[3] It is named for William L. Marcy.[4]
Marcy Township covers an area of 42.06sqmi, and contains no incorporated settlements. According to the USGS, it contains seven cemeteries: Glenwood, Holloway, Oakwood, Pleasant Hill, Quincy, Sparks and Swede Valley Lutheran.