Occidental is a census-designated place (CDP) in Sonoma County, California, United States. The population was 1,115 at the 2010 census, down from 1,272 at the 2000 census.
Occidental is located at 38°24′27″N 122°56′54″W / 38.4074146°N 122.9483307°W / 38.4074146; -122.9483307. The CDP has a total area of 4.97 sq mi (12.9 km2), all land.
The cooperative National Weather Service station reports that Occidental has cool, wet winters and warm, dry summers.