| Massack | |
| 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 |
| Unit Pref: | US |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Plumas County |
| Coordinates: | 39.9261°N -120.8378°W |
| Elevation M: | 1110 |
| Elevation Ft: | 3642 |
Massack is an unincorporated community in Plumas County, California. It lies at an elevation of 3642 feet (1110 m). Massack is located on the Western Pacific Railroad, 3.5miles northwest of Spring Garden. California State Route 89 runs through Massack.
The Massack post office operated from 1917 to 1939, moving in 1937.