| Official Name: | Mosher, Missouri |
| Settlement Type: | unincorporated community |
| Mapsize: | 250x200px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | Sainte Genevieve |
| Subdivision Type3: | Township |
| Subdivision Name3: | Sainte Genevieve |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation M: | 135 |
| Elevation Ft: | 443 [1] |
| Coordinates: | 37.9712°N -90.0768°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 63670 |
| Area Code: | 573 |
| Blank Name: | FIPS code |
| Blank Info: | 29-50258 [2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 721737 |
Mosher is an unincorporated community in Ste. Genevieve Township in eastern Sainte Genevieve County, Missouri, United States. It is situated approximately two miles west of Ste. Genevieve. The community most likely was named after a local French colonial family Mosier or Mosieur. English spelling of the French pronunciation may account for the spelling of the community's name. The community developed as a stop along the Missouri-Illinois Railroad.[3]