| Official Name: | Union Township, Brown County, Ohio |
| Settlement Type: | Township |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | County |
| Subdivision Name2: | Brown |
| Unit Pref: | Imperial |
| Area Total Km2: | 100.1 |
| Area Land Km2: | 98.4 |
| Area Water Km2: | 1.8 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 2739 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Footnotes: | [2] |
| Elevation M: | 170 |
| Elevation Ft: | 558 |
| Coordinates: | 38.75°N -83.8294°W |
| Blank Name: | FIPS code |
| Blank Info: | 39-78232[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1085806 |
Union Township is one of the sixteen townships of Brown County, Ohio, United States. The 2020 census found 2,739 people in the township.
Located in the southern part of the county along the Ohio River, it borders the following townships:
Kentucky lies across the Ohio River to the southwest: Mason County to the south, and Bracken County to the west.
The village of Ripley is located in southwestern Union Township, along the Ohio River.
It is one of twenty-seven Union Townships statewide.[4]
In 1833, Union Township contained six gristmills and eight saw mills.[5]
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,[6] 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.