The Cathedral of Saint Augustine (Spanish: Catedral de San Agustín) is the mother church of the Roman Catholic Diocese of Tucson.

The cathedral parish's history began with the founding of the chapel of the Royal Presidio of San Agustin in Tucson, which was constructed in 1776.

[1] The church was rebuilt by Bishop Peter Bourgade in 1897; the original plans called for a Gothic structure, but the spires were never completed.

[3] It was only in 1928 that the brick structure was transformed into its present Mexican baroque form, including the cast stone façade, which was inspired by the Cathedral of Querétaro, Mexico.

[3] A restoration project, which entirely demolished and rebuilt the cathedral with the exception of its façade and towers, coincided with the centenary anniversary of the completion of the original church.

Various indigenous desert plants are featured in the stone designs, such as yucca and saguaro blossoms, as well as a representation of the Mission San Xavier del Bac.

[1] As part of the first ground-up restoration project since 1968, the oldest cathedral in town began renovations under the leadership of John Alan a Phoenix artist and Historic Preservationist.

The side altars, also known as retablos, were made from handcrafted wood and decorated to honor the Blessed Sacrament Chapel and Our Lady of Guadalupe Shrine.