The Presidio of San Francisco (originally, El Presidio Real de San Francisco or The Royal Fortress of Saint Francis) is a park and former U.S. Army post on the northern tip of the San Francisco Peninsula in San Francisco, California, and is part of the Golden Gate National Recreation Area.

It had been a fortified location since September 17, 1776, when New Spain established the presidio to gain a foothold in Alta California and the San Francisco Bay. It passed to Mexico in 1820, which in turn passed it to the United States in 1848. As part of a 1989 military reduction program under the Base Realignment and Closure (BRAC) process, Congress voted to end the Presidio's status as an active military installation of the U.S. Army. On October 1, 1994, it was transferred to the National Park Service, ending 219 years of military use and beginning its next phase of mixed commercial and public use.In 1996, the United States Congress created the Presidio Trust to oversee and manage the interior 80% of the park's lands, with the National Park Service managing the coastal 20%. In a first-of-its-kind structure, Congress mandated that the Presidio Trust make the Presidio financially self-sufficient by 2013. The Presidio achieved the goal in 2005, eight years ahead of the scheduled deadline.The park has many wooded areas, hills, and scenic vistas overlooking the Golden Gate Bridge, San Francisco Bay, and the Pacific Ocean. It was recognized as a California Historical Landmark in 1933 and as a National Historic Landmark in 1962.