Piedras Blancas Light Station, Maritime lighthouse in San Simeon, United States.

Piedras Blancas Light Station is a lighthouse standing about 70 feet (21 m) tall on a rocky coastal point near San Simeon, California. The white tower rises from a flat, wind-swept headland above the Pacific, surrounded by low coastal scrub and a cluster of historic support buildings.

The first-order Fresnel lens was lit on 15 February 1875. Earthquakes damaged the tower over the years, and after a quake centred 6 miles offshore on 31 December 1948 the fourth landing, watch room and lantern were removed, leaving the truncated tower about 70 feet tall. Management passed from the United States Lighthouse Service to the Coast Guard in 1939; the light was automated and the station unmanned in 1975. The Bureau of Land Management took over in 2001, tasked with restoring the station to its 1875–1940 period.

The name Piedras Blancas means 'white rocks' in Spanish, referring to the pale offshore rocks that sailors used as a natural landmark long before any lighthouse stood here. Guided tours let visitors handle period equipment and see how keepers once managed the light through fog and storm.

Access to the site is only possible through guided tours that must be booked in advance, and the visit involves a short walk across open, exposed ground. The headland is very windy, so layering up with wind-resistant clothing and wearing sturdy shoes makes the walk more comfortable.

The 1948 earthquake that damaged the tower was centred about 6 miles (9.7 km) offshore; the upper three floors were then removed, leaving the truncated tower seen today. The first-order Fresnel lens was taken down and is displayed in Cambria. The 1959 film The Monster of Piedras Blancas was not shot here: its lighthouse scenes were filmed at Point Conception Light.