Castella is a small, unincorporated community and census-designated place (CDP) in the upper Sacramento Canyon of Shasta County, California.

It is located 46 miles north of Redding on Interstate 5, and is home to Castle Crags State Park.

Visitors use Castella as a base to engage in nationally recognized trout fishing in the nearby Sacramento[3][4][5] McCloud[3][4] and Klamath,[3] Rivers, or come to see and climb Mount Shasta, Castle Crags or the Trinity Alps.

[6] In the state legislature Castella is located in the 1st Senate District, represented by Republican Ted Gaines, and in the 1st Assembly District, represented by Republican Brian Dahle.

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