| Official Name: | Union Township, Logan County, Ohio |
| Settlement Type: | Township |
| Mapsize: | 250px |
| Image Map1: | Map of Logan County Ohio Highlighting Union Township.png |
| Mapsize1: | 250px |
| Map Caption1: | Location of Union Township in Logan County |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | County |
| Subdivision Name2: | Logan |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 59.51 |
| Area Land Km2: | 59.29 |
| Area Water Km2: | 0.22 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 755 |
| Population Density Km2: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Footnotes: | [3] |
| Elevation Ft: | 1040 |
| Coordinates: | 40.3017°N -83.8239°W |
| Area Code: | 937, 326 |
| Blank Name: | FIPS code |
| Blank Info: | 39-78414[4] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1086495 |
Union Township is one of the seventeen townships of Logan County, Ohio, United States. As of the 2020 census, the population was 755.
Located in the southwestern part of the county, it borders the following townships:
No municipalities are located in Union Township.
Union Township was formed in 1820.[5] It is one of twenty-seven Union Townships statewide.[6]
The township is governed by a three-member board of trustees, who are elected in November of odd-numbered years to a four-year term beginning on the following January 1. Two are elected in the year after the presidential election and one is elected in the year before it. There is also an elected township fiscal officer,[7] who serves a four-year term beginning on April 1 of the year after the election, which is held in November of the year before the presidential election. Vacancies in the fiscal officership or on the board of trustees are filled by the remaining trustees.
State Route 508 passes through Union Township.