It is a suffragan of the Metropolitan Archdiocese of Sassari, on Sardinia, insular Italy.

In 1106 John, Bishop of Alghero, assisted at the consecration of the Church of the Trinity in Saccargia.

Pietro Parens, a Genoese, became bishop; he was present at the Fifth Lateran Council in 1512.

On Monday, 31 January 2011, the Vatican Information Service (VIS) announced that Pope Benedict XVI had appointed Mauro Maria Morfino [it], Professor of Holy Scripture at the Pontifical Theological Faculty of Sardinia, as Bishop-elect of the Diocese of Alghero-Bosa, Italy.

(all Roman Rite) Media related to Roman Catholic Diocese of Alghero-Bosa at Wikimedia Commons This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed.