Mariano Simon Garriga (May 30, 1886 – February 21, 1965) was an American prelate of the Roman Catholic Church. He served as Bishop of Corpus Christi from 1949 until his death in 1965.
Mariano Garriga was born in Port Isabel, Texas, to Frank and Elizabeth (née Baker) Garriga. He studied at St. Mary College in Kansas City, Kansas, and at St. Francis Seminary in Milwaukee, Wisconsin. He was ordained to the priesthood on July 2, 1911. He then served as assistant chancellor of the Archdiocese of San Antonio until 1912, when he became a curate in Marfa.
In 1915 he was named vice-rector of St. John Seminary in San Antonio. He served as a chaplain to the National Guard during World War I, training with the 36th Infantry Division. From 1919 to 1936, he was pastor of St. Cecilia Church in San Antonio. He also served as president of Incarnate Word College. He was a professor at St. John Seminary from 1921 to 1936, and became historian of the San Antonio Archdiocese in 1926. He was raised to the rank of Papal Chamberlain in October 1934, and a Domestic Prelate in September 1935.