Dr. Alonso Núñez de Haro y Peralta (October 31, 1729 – May 26, 1800) was archbishop of Mexico from September 12, 1772, to May 26, 1800, and viceroy of New Spain from May 8, 1787, to August 16, 1787.

Núñez de Haro was born in the diocese of Cuenca, Spain, probably on October 31, 1729, although some sources give the date as November 1.

As archbishop, he converted the Jesuit colegio of Tepotzotlán into the Seminario de Instrucción, Retiro Voluntario y Corrección, a combined site of instruction for priests, retirement home, and jail for ecclesiastics, since with ecclesiastical privileges (fuero eclesiástico), priests were under the jurisdiction of canonical courts.

Haro supported obedience to the Spanish monarch, and followed the request of Minister of the Indies, José de Gálvez to "exhort his flock not to defraud the Crown of its legitimate revenue by engaging in contraband.

"[2] Around 1770, Núñez de Haro wrote to Charles III recommending that major government positions be reserved to those born in Spain, arguing that creoles were unsuited to high office.

This was an unpopular stance, especially among creoles, and a 1771 complaint from the municipal council asked Charles III to reprimand Núñez de Haro.

After leaving the office of viceroy, Núñez de Haro continued as archbishop of Mexico for the remainder of his life.