| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Rock Grove Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Stephenson |
| Leader Title: | Supervisor |
| Leader Name: | George Suess |
| Area Total Sq Mi: | 30.42 |
| Area Land Sq Mi: | 30.27 |
| Area Water Sq Mi: | 0.15 |
| Area Water Percent: | 0.49 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 45.9 |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Coordinates: | 42.4789°N -89.4864°W |
| Elevation Ft: | 958 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 1347 |
| Blank Name: | FIPS code |
| Blank Info: | 17-177-65065 |
Rock Grove Township is located in Stephenson County, Illinois. As of the 2010 census, its population was 1,388 and it contained 761 housing units.[2] The unincorporated community of Rock Grove is located in the township, and once Duncannon was located here also.
Rock Grove is Township 28 (part) and 29 North, Range 8 (part) and 9 East of the Fourth Principal Meridian.
According to the 2010 census, the township has a total area of, of which (or 99.51%) is land and (or 0.49%) is water.[2]