Rancho Ulistac was a 2,217-acre (8.97 km2) Mexican land grant in present-day Santa Clara County, California, given in 1845 by Governor Pío Pico to Marcello and Cristobal, Indians. The grant extended across lowlands reaching from the Alviso shoreline southward and encompassing the land between the Guadalupe River and Saratoga Creek, and the town of Agnew.