| Official Name: | Gratis Township, Preble 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: | Preble |
| Leader Title: | Trustees |
| Leader Name: | Jeff Lynch, Chad Adkins, & Greg Thompson |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 36.8 |
| Area Land Sq Mi: | 36.8 |
| Area Water Sq Mi: | 0.0 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 4224 |
| Population Density Sq Mi: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Footnotes: | [2] |
| Elevation Ft: | 938 |
| Coordinates: | 39.6164°N -84.5419°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 45330 |
| Area Code: | 937, 326 |
| Blank Name: | FIPS code |
| Blank Info: | 39-31486[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1086847 |
Gratis Township is one of the twelve townships of Preble County, Ohio, United States. The 2020 census found 4,224 people in the township.
Located in the southeastern corner of the county, it borders the following townships:
Two incorporated villages are located in Gratis Township: Gratis in the north, and West Elkton in the south.
According to tradition, Gratis Township's name is derived from the original request, namely "we think we ought to have the township gratis".[4] It is the only Gratis Township statewide.[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.