The Stanley Mosk Courthouse is a courthouse in Los Angeles, California home to the Los Angeles County Superior Court. It is located at 110 N. Grand Avenue and 111 N. Hill Street between Temple and First streets, lining Grand Park in the Civic Center in Downtown Los Angeles. The building was constructed in 1958 and has a floor area of 220,860 square feet (20,519 m2) in its west wing and 515,340 square feet (47,877 m2) in the east wing. It has 100 courtrooms, 840 daily workers and 7000 daily visitors. The courthouse is often seen in the TV series Perry Mason, when the title character parks his car on Hill Street to go inside the building.

On February 1, 2008, American musician Britney Spears was involuntarily placed under a conservatorship by Judge Reva Goetz, with her father, James "Jamie" Spears, and attorney Andrew M. Wallet, as conservators. The conservatorship lasted until November 2021.