Ocean Beach, Sandy beach in western San Francisco, United States

Ocean Beach runs 3.5 miles along San Francisco's Pacific coast, from the Cliff House and the former Sutro Baths site at its northern end south past Sloat Boulevard. The sand is pale tan and mostly flat, marked by shallow tracks; a low concrete wall separates it from the Great Highway and the paved walkway beside it. The beach narrows toward a dark, low headland in the distance.

The beach gained prominence in the 1880s when a steam railroad connected it to downtown San Francisco, leading to increased visitor numbers. Several amusement facilities were built along the shoreline in the following decades, though these later disappeared.

In January, locals pile up discarded Christmas trees in heaps of 30 or more and set them alight in large bonfires on the sand. The beach also appears in Third Eye Blind's song "Motorcycle Drive By", and Kelly Slater won his 11th world surfing title here on 6 November 2011.

Strong currents and cold water temperatures make this beach better suited for experienced surfers rather than casual swimmers. Dense coastal fog often rolls in during mornings and typically clears by afternoon.

The King Philip, a three-masted clipper, wrecked off Ocean Beach on 25 January 1878. Its remains surface only at exceptional low tides: recorded sightings came in 1980, May 2007 and March 2011.