| Hammil Valley | |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | California#USA |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in California |
| Pushpin Image: | California Locator Map with US.PNG |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Name1: | California |
| Subdivision Type2: | County |
| Subdivision Name2: | Mono County |
| Established Date: | 1870 |
| Coordinates: | 37.6786°N -118.4036°W |
| Elevation M: | 1400 |
| Elevation Ft: | 4593 |
| Population Est: | 102 |
| Pop Est As Of: | 2000 |
| Pop Est Footnotes: | [1] |
Hammil Valley is an unincorporated community in Mono County, California. It is located 9miles west-northwest of White Mountain Peak, at an elevation of 4593 feet (1400 m).
The Hammil brothers (William, Hugh, and Robert) homesteaded at the site in 1870. The Carson and Colorado Railroad built a train station in 1883 and named it after the brothers. The area's postal service was handled by the Mocalno, which operated from 1915 to 1937. Mocalno was named by adding "cal" for California in the Mono (the county's name).
Today, most of the residents of Hammil Valley go to school or work in Bishop.[2]