Fort Funston, Former harbor defense site and protected coastal park in San Francisco, United States

Fort Funston is a former harbor defense site on the southwestern San Francisco coast, now part of the Golden Gate National Recreation Area. Its windswept headlands above steep sandstone cliffs hold remnants of a sand dune ecosystem and World War I–era batteries. A wooden deck overlook with curved concrete structures and a rusted dome-shaped metal object sits above the beach.

This coastal site was developed as a military fortification in the early 1900s to defend California's shoreline during world conflicts. Following the end of military operations, it transitioned into a protected nature area under the Golden Gate Recreation Area system.

The site bears the name of a military officer and retains visible remnants of its defense installations from decades past. These structures shape how visitors experience the landscape today and serve as physical reminders of the coast's strategic importance.

Parking areas along Skyline Boulevard provide the main access point to the grounds, with facilities like restrooms and picnic tables available. The exposed bluffs and open terrain can be visited year-round, though wind and fog are common conditions to prepare for.

In 2003 Erin Hemmings set the world record for the farthest thrown object here, throwing an Aerobie flying ring 1,333 feet. The fort is also the only park in the Golden Gate National Recreation Area where dogs may run off-leash.