A Presidio was a type of fortress built by the Spanish in North Africa during the 16th century to protect against pirates. Presidios were located in the Southwest United States as well:

• The Presidio of Monterey is a military facility, founded in 1770 and currently housing the Defense Language Institute, in Monterey, California.
• The Presidio of San Diego, founded in 1769 in San Diego, California.
• The Presidio of San Francisco is a former military facility, founded in 1776 and now part of the Golden Gate National Recreation Area in San Francisco, California.
• The Presidio of Santa Barbara is a former military facility, founded in 1782 in Santa Barbara, California.
• The Presidio of Sonoma, or Sonoma Barracks, was established in 1836 by Mariano Guadalupe Vallejo (the "Commandante-General of the Northern Frontier of Alta California") in Sonoma, California as a part of Mexico's strategy to halt Russian incursions into the region.
• The Presidio San Ignacio de Tubac was founded in June of 1752 in Tubac, Arizona

The word can also be used for the following:

• Presidio, Texas is a place in the State of Texas in the United States of America.
• Presidio Corporation is a company engaged in designing and maintaining computer networks.
• Presidio Winery is a company in Santa Barbara County, California producing wine.
• Presidio World College is an educational institution.
• The Presidio is a movie starring Sean Connery, Meg Ryan, and Mark Harmon, set around the Presidio of San Francisco.
• AMD Presidio Technology is a Trusted Computing platform developed by Advanced Micro Devices

Presidio