| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Garden Plain Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Whiteside |
| Leader Title: | Supervisor |
| Area Total Sq Mi: | 31.6 |
| Area Land Sq Mi: | 30.7 |
| Area Water Sq Mi: | 0.9 |
| Area Water Percent: | 2.85 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 34.9 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Coordinates: | 41.7983°N -90.1444°W |
| Elevation Ft: | 689 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 1044 |
| Blank Name: | FIPS code |
| Blank Info: | 17-195-28586 |
Garden Plain Township is located in Whiteside County, Illinois. As of the 2021 census, its population was 983 and it contained 492 housing units.[2]
According to the 2021 census, the township has a total area of, of which (or 97.15%) is land and (or 2.85%) is water.[2]