| Official Name: | Monroe Township, Butler County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Butler |
| Area Total Km2: | 92.88 |
| Area Land Km2: | 92.88 |
| Area Water Km2: | 0 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.86 |
| Area Land Sq Mi: | 35.86 |
| Area Water Sq Mi: | 0 |
| Population As Of: | 2020 |
| Population Total: | 1653 |
| Population Density Km2: | 17.8 |
| Population Density Sq Mi: | 46.1 |
| Elevation Footnotes: | [1] |
| Elevation M: | 290 |
| Elevation Ft: | 951 |
| Coordinates: | 42.6017°N -92.8444°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-92967[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468392 |
Monroe Township is one of sixteen townships in Butler County, Iowa, USA. As of the 2020 census, its population was 1,653.[3]
Monroe Township covers an area of 35.86sqmi and contains one incorporated settlement, Aplington. According to the USGS, it contains five cemeteries: Bethel Reform, Monroe Township, Oak Hill, Pleasant View and Saint Patricks Catholic.