| Official Name: | Green Bay Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Clarke |
| Area Total Km2: | 94.68 |
| Area Land Km2: | 94.68 |
| Area Water Km2: | 0 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 36.56 |
| Area Land Sq Mi: | 36.56 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2000 |
| Population Total: | 232 |
| Population Density Km2: | 2.5 |
| Population Density Sq Mi: | 6.3 |
| Elevation M: | 344 |
| Elevation Ft: | 1129 |
| Coordinates: | 40.9456°N -93.7369°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0467967 |
Green Bay Township is a township in Clarke County, Iowa, USA. As of the 2000 census, its population was 232.
Green Bay Township covers an area of 36.56mi2 and contains no incorporated settlements. According to the USGS, it contains four cemeteries: Chaney, Ellis, Green Bay and Hebron.
The streams of Hoosier Creek and North Hoosier Creek run through this township.