| Official Name: | New Dover, Ohio |
| Settlement Type: | Unincorporated community |
| Mapsize: | 250px |
| Pushpin Map: | Ohio |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Union |
| Unit Pref: | Imperial |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 968 |
| Coordinates: | 40.2467°N -83.3047°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 43040 |
| Area Code: | 937, 326 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1065116 |
New Dover is an unincorporated community in Dover Township, Union County, Ohio, United States. It is located along U.S. Route 36, about three miles east of Marysville.[1]
New Dover was originally called Dover, and under the latter name was laid out and platted in 1854.[2] The New Dover Post Office was established on February 5, 1856. As of 1877, the village did a considerable amount of manufacturing business. It contained one church, a school-house, one harness shop, one blacksmith shop, and several other stores.[3] The post office was discontinued on April 30, 1935. The mail service is now sent through the Marysville branch.