Yerba Buena Light, Wooden lighthouse on Yerba Buena Island, San Francisco Bay, US

Yerba Buena Light is a 25-foot (7.6 m) octagonal wooden tower with a gallery and lantern, standing on the southeast side of Yerba Buena Island in San Francisco Bay. Its occulting light, at a focal height of 29 m above sea level, shows a long white flash every 4 seconds (3 seconds light, 1 second dark) and has a nominal range of 14 nautical miles (about 26 km).

The lighthouse was established in 1875 when the Lighthouse Service relocated its district headquarters to Yerba Buena Island. This move reflected the growing importance of San Francisco Bay as a major shipping center.

The structure represents Late Gothic Revival and Stick/Eastlake architectural elements, earning its place on the National Register of Historic Places in 1991.

The lighthouse is not open to the public and stands on Yerba Buena Island, reached by boat or via the island's road connections. The light was automated in 1958, so no keeper is on duty; the former keeper's quarters now house the Coast Guard district commander. Views of the octagonal wooden tower come from the water or from the Bay Bridge crossing overhead.

The 1875 tower received a fifth-order Fresnel lens taken from the recently decommissioned Yaquina Bay Light in Newport, Oregon; a second fifth-order lens replaced it in 1886. The light was automated by the U.S. Coast Guard in 1958, and the former keeper's quarters now house the Coast Guard admiral.