| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Harmon 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: | Christopher Norberg |
| Established Title: | Established |
| Established Date: | March 3, 1857 |
| Area Total Sq Mi: | 35.86 |
| Area Land Sq Mi: | 35.86 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 10.5 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 358 |
| Blank Name: | FIPS code |
| Blank Info: | 17-103-32980 |
Harmon Township is located in Lee County, Illinois. As of the 2010 census, its population was 378 and it contained 161 housing units.[2] Harmon Township was formed from Marion Township on March 3, 1857.
According to the 2010 census, the township has a total area of, all land.[2]