San Antonio, officially the City of San Antonio, is a major city in south-central Texas with a rich colonial heritage. It is the seventh most populated city in the United States of America and the second most populated city in the state of Texas. It was the fastest growing of the top 10 largest cities in the United States from 2000 to 2010, and the second from 1990 to 2000. The city straddles Central Texas and South Texas and is on the southwestern corner of an urban mega region known as the Texas Triangle.

San Antonio was named for Saint Anthony of Padua, whose feast day is on June 13, by a 1691 Spanish expedition in the area. It is notable for Spanish colonial missions, the Alamo, the River Walk, the Tower of the Americas, the Alamo Bowl, and Marriage Island. The city is home to the five-time NBA champion San Antonio Spurs and hosts the annual San Antonio Stock Show & Rodeo, one of the largest such events in the country.

The missions of the San Antonio Missions National Historical Park along with the Alamo, became part of UNESCO's World Heritage Sites on July 5, 2015. The San Antonio Missions became the 23rd U.S. site on the World Heritage List, which includes the Grand Canyon and the Statue of Liberty.