| Day | |
| 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: | Modoc County |
| Coordinates: | 41.2117°N -121.3744°W |
| Elevation M: | 1111 |
| Elevation Ft: | 3645 |
Day is an unincorporated community in Modoc County, California. It is located 22miles west of Adin, at an elevation of 3645 feet (1111 m).
A post office operated at Day from 1888 to 1925 and from 1926 to 1953.
The lightining-sparked Day Fire in 2014 started just north of the community, ultimately destroying 6 structures and injuring 7 people.[1]