Alfredo José Isaac Cecilio Francisco Méndez-Gonzalez CSC (June 3, 1907 – January 28, 1995) was an American Catholic bishop who served in Puerto Rico[1] and who later became involved with sedevacantists.

Alfredo Méndez-Gonzalez was born in Chicago, Illinois, United States, on June 3, 1907, of mixed Spanish and Puerto Rican ancestry.

As a priest in Austin, he devoted himself to Mexican immigrants (the Catholic Church in Mexico was suffering persecution during this time).

[3] On July 23, 1960, Pope John XXIII named Méndez the first bishop of Arecibo, Puerto Rico.

[3] From his retirement, he had steady correspondence with the Vatican and with other bishops, urging the return of the traditional Latin Mass.

[10] In July 1990, after two years of attempts to negotiate a regular ordination for Baumberger and Greenwell with some as yet active bishop, Méndez decided that he himself will ordain them without the ordinary authorizations.

[3] They discussed the question of excommunication at some length and talked about an interview with canon lawyer Count Neri Capponi that appeared in the May–June 1993 issue of The Latin Mass magazine, where Capponi expressed the view that Archbishop Lefebvre was not really excommunicated for the Écône consecrations.

Jenkins arrived at the hospital in Vista, California, and administered the Sacrament of Extreme Unction and gave the Apostolic Benediction to Méndez, who then gradually but swiftly improved and recovered.

[3] On October 19, 1993, in his private chapel in his home in Carlsbad, California, Méndez consecrated Kelly a bishop, in secret and without papal permission.

[3][12] In January 1995, the priests of the SSPV brought Méndez to Cincinnati to show him a church property they hoped he would buy for them.