| Westside | |
| Settlement Type: | Unincorporated community Census designated place |
| 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: | Fresno County |
| Population As Of: | 2020 |
| Population: | 143 |
| Population Footnotes: | [1] |
| Coordinates: | 36.4006°N -120.1392°W |
| Elevation M: | 76 |
| Elevation Ft: | 249 |
Westside (formerly, O'Neill) is an unincorporated community and census designated place (CDP) in Fresno County, California. It is located 22miles northeast of Coalinga, at an elevation of 249 feet (76 m).