| Official Name: | Warren Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Jo Daviess County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Jo Daviess County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Jo Daviess |
| Leader Title: | Supervisor |
| Leader Name: | Laura Busch |
| Established Title: | Established |
| Established Date: | November 2, 1852 |
| Area Total Sq Mi: | 19.7 |
| Area Land Sq Mi: | 19.7 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 81.3 |
| Elevation M: | 304 |
| Elevation Ft: | 997 |
| Coordinates: | 42.4825°N -90.0208°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 61001, 61087 |
| Blank Name: | FIPS code |
| Blank Info: | 17-085-78864 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 1518 |
| Unit Pref: | Imperial |
Warren Township is one of twenty-three townships in Jo Daviess County, Illinois, United States. As of the 2010 census, its population was 1,601, and it contained 770 housing units.[2] Its name changed from Courtland Township in 1865.
According to the 2010 census, the township has a total area of, all land.[2]
The township contains two cemeteries: Elmwood and Saint Annes Catholic.