Robert J. Fox (December 24, 1927 – November 26, 2009) was an American priest of the Roman Catholic faith. He was a prolific author of religious books, and appeared on many Roman Catholic television programs and conferences. Fox also served as a diocesan priest for several rural towns in South Dakota. He was the Director of the International Fatima Family Apostolate and Youth for Fatima Pilgrimages , editor of the Immaculate Heart Messenger, and his writings appeared frequently in other Catholic publications in the US. He began the Marian Congress in the United States which is held annually and attended by thousands.