| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Monmouth Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Warren |
| Leader Title: | Supervisor |
| Established Title: | Established |
| Established Date: | November 8, 1853 |
| Area Total Sq Mi: | 36.97 |
| Area Land Sq Mi: | 36.86 |
| Area Water Sq Mi: | 0.12 |
| Area Water Percent: | 0.32 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 283.9 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 10222 |
| Blank Name: | FIPS code |
| Blank Info: | 17-187-50023 |
Monmouth Township is located in Warren County, Illinois, United States. As of the 2010 census, its population was 10,463 and it contained 4,237 housing units.[2]
The township's name commemorates the Battle of Monmouth.[3]
According to the 2010 census, the township has a total area of, of which (or 99.70%) is land and (or 0.32%) is water.[2]
The city of Monmouth is located in this township.