Farallon Island Light, Maritime lighthouse in Southeast Farallon Island, California.

Farallon Island Light is a lighthouse on Southeast Farallon Island, a small and rocky outcrop off the California coast roughly 27 miles (43 km) west of San Francisco. The tower stands on a steep, exposed island that has no permanent public access, sitting above the water with no vegetation around it.

Construction of the lighthouse began in 1853, but the first tower proved too narrow for the first-order Fresnel lens ordered from France. It was torn down and rebuilt wider, and the light was first lit in December 1855. The United States Lighthouse Board had contracted Francis A. Gibbons and Francis S. Kelly of Baltimore to build it.

The keepers of Farallon Island Light joined the egg trade themselves: Amos Clift, one of the first keepers, was dismissed by the Lighthouse Board for trying to monopolise the business. Tensions between keepers, the Pacific Egg Company and armed adventurers led to the Egg Wars, with shootings in 1863 and 1881.

The island is closed to the general public as it is a protected wildlife area, but the lighthouse can be seen from boat tours that depart from San Francisco. The waters around the island can be rough, so visitors on such tours should dress for wind and cold even in summer.

During the early years of operation, a mule lived on the island and was used to carry supplies across the steep terrain, as no other means of transport was available. This detail gives a sense of how isolated and demanding life was for the keepers who lived there.