| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Millersburg Township |
| Image Map1: | Map of Illinois highlighting Mercer County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Mercer County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Mercer |
| Leader Title: | Supervisor |
| Established Title: | Established |
| Established Date: | November 8, 1853 |
| Area Total Sq Mi: | 36.32 |
| Area Land Sq Mi: | 36.32 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 20.8 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 707 |
| Blank Name: | FIPS code |
| Blank Info: | 17-131-49256 |
Millersburg Township is located in Mercer County, Illinois. As of the 2010 census, its population was 755 and it contained 334 housing units.[2]
Millersburg is named after George Abraham Miller, a Primitive Baptist who, with several families, settled in Mercer County, Illinois on the Edwards River in 1834. These families traveled from Crawfordsville, Montgomery County, Indiana for the purpose of expanding the church into the area. The congregation was known as the Edwards River Church of Regular Baptists.[3] The Church was disbanded in 1847, and the last of the Original settlers Isaac Miller, left for Oregon in 1851.
According to the 2010 census, the township has a total area of, all land.[2]