List of county courthouses in California

Counties of California
IMP SD RIV ORA SBD LA KER VEN SB SLO MON SBT FRE KIN TUL INY MNO ALP TUO MPA MAD MER SCL SCR SM SF→ ALA CC SJ STA CAL AMA ED SAC SOL YOL NAP MRN SON MEN LAK COL SUT YUB PLA NEV SIE BUT GLE TEH PLU LAS MOD SHA SIS TRI HUM DN

This is a list of county courthouses and other non-federal courthouses in California, both current and former. For federal courthouses located in California, see List of United States federal courthouses in California.

The U.S. state of California has 58 counties. Following the U.S. conquest of California, it was divided into 27 counties on 18 February 1850. Between 1860 and 1907, the original 27 counties were subdivided into the current 58 counties.

Courthouses often reflect the Californian architectural styles that were popular at the time they were built, including Neoclassical, Spanish Colonial Revival, Beaux-Arts, Italianate, and Art Moderne styles. Mariposa County Courthouse is California's oldest courthouse, built in 1854.