| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Hamilton Township |
| Image Map1: | Map of Illinois highlighting Lee County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Lee County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Lee |
| Leader Title: | Supervisor |
| Leader Name: | Stacy Gonigam |
| Established Title: | Established |
| Established Date: | November 6, 1849 |
| Area Total Sq Mi: | 35.72 |
| Area Land Sq Mi: | 35.72 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 5.7 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 194 |
| Blank Name: | FIPS code |
| Blank Info: | 17-103-32447 |
Hamilton Township is located in Lee County, Illinois. As of the 2010 census, its population was 205 and it contained 82 housing units.[2] Three townships were formed from Hamilton Township. First Marion Township and May Township were formed in September, 1854, and then East Grove Township was formed on November 9, 1864.
According to the 2010 census, the township has a total area of, all land.[2]