List of the oldest buildings in Texas

This article attempts to list the oldest buildings in the state of Texas in the United States of America, including the oldest houses in Texas and any other surviving structures, including those constructed during the Spanish colonization, before independence and during the early republic. Some dates are approximate and based on architectural studies and historical records, other dates are based on dendrochronology. All entries should include citation with reference to: period architectural features; a report by an architectural historian; or dendrochronology. Sites on the list are generally from the earliest period architecture. Only buildings built prior to 1840 are suitable for inclusion on this list or the building must be the oldest of its type.