Antonio de San Buenaventura y Olivares or simply Fray Antonio de Olivares (1630 - 1722) was a Spanish Franciscan who officiated at the first Catholic Mass celebrated in Texas, and he was known for contributing to the founding of San Antonio and to the prior exploration of the area. He founded, among other missions, the Alamo Mission in San Antonio (better known as simply the Alamo), the Presidio San Antonio de Bexar, and the Acequia Madre de Valero.