Tubac Presidio State Historic Park, Spanish colonial historic site in Tubac, Arizona, US.

Tubac Presidio State Historic Park preserves the ruins of the Presidio San Ignacio de Tubac, a Spanish fort established in 1752. Its centerpiece is an underground exhibit of the presidio foundations and walls, excavated in 1974 by University of Arizona archaeologists. The grounds also hold an 1885 schoolhouse with desks, chalkboards and a potbelly stove, the 1914 Otero Hall, the Rojas House and a museum covering the site's settlement periods.

This military settlement was established in 1752 as a defense against Apache raids and other threats to Spanish colonists in the region. The fortified site served as a launching point for major expeditions northward into unexplored territories.

Each October the park holds Anza Days, when the Anza Trail Color Guard rides in from nearby Tumacácori and recounts Juan Bautista de Anza's 1774 departure for San Francisco. The museum labels its displays by period: American Indian before 1752, Spanish Colonial 1752–1821, Mexican Republic 1821–1854 and Anglo Territorial 1854–1912.

The presidio foundations lie in an underground exhibit reached from the visitor center, and the 1885 schoolhouse, 1914 Otero Hall and Rojas House stand on the grounds; the Juan Bautista de Anza National Historic Trail trailhead and St. Ann's Church are adjacent. Paths are marked but shade is scarce, so bring sun protection and water.

This location served as the gathering point for a major expedition that departed northwestward and resulted in the founding of San Francisco. The assembly and departure of hundreds of colonists from this spot made it a critical moment in western expansion.