This list of islands of California is organized into sections, generally arranged from north to south. The islands within each section are listed in alphabetical order.

The Geographic Names Information System (GNIS) lists 527 named islands in the state.^[1]

For the Farallon Islands, see § Farallon Islands, below. For islands in the Sacramento River Delta, see § Sacramento–San Joaquin River Delta, below. For islands in Suisun Bay, see § Suisun Bay, below.

Other islands of the San Francisco Bay Area:

The Farallon Islands are a group of rugged small islands over 20 miles (32 km) offshore from the mainland of the City and County of San Francisco, which they are also formally within. They consist of over twenty small islets divided into north, south and middle sections, as well as a major bank, Fanny Shoal. The surrounding waters were once used as a disposal site for radioactive waste.^[9]

The Channel Islands are a group of eight main islands and several minor islands in the Pacific Ocean off the coast of Santa Barbara, Los Angeles, and Ventura counties in Southern California. The four northern islands are protected in Channel Islands National Park, while two are used by the U.S. Navy. These Islands are part of the Greater Los Angeles Area.

The Greater Los Angeles Area is an urban area on the Pacific coast of southern California.

The bay associated with Newport Harbor and the city of Newport Beach, California.

• Geography of California
• List of islands of the United States
• Outline of California
• Peninsulas of California