Oak Run (also Oakrun) is a small an unincorporated community and census-designated place (CDP) 23 miles (37 km) east of Redding in Shasta County, California, United States.

Federally, Oak Run is in California's 1st congressional district, represented by Republican Doug LaMalfa.

[5] Oak Run is home to the Phillips Brothers Mill, the last fully steam-powered sawmill in the United States,[6] which is listed on the National Register of Historic Places.

Two month, January and February, experience freezing weather, with 12 inches of annual snowfall.

The area receives an average of 63 inches of rain annually, concentrated during the months of November through March.