Alberic of Ostia (1080–1148) was a Benedictine monk, and Cardinal Bishop of Ostia from 1138 to 1148.
He was born at Beauvais in France. He entered the monastery of Cluny and became its sub-prior and, later, prior of Saint-Martin-des-Champs, but was recalled (1126) to Cluny by Peter the Venerable, to aid in the restoration of discipline in that famous monastery.
In 1131 he was Abbot of Vezelay in the Diocese of Autun, and held that office until he was made Cardinal-Bishop of Ostia by Pope Innocent II (1138). Immediately after his consecration Alberic went as papal legate to England. He was successful in his endeavours to end the war then raging for possession of the throne between the usurper Stephen of Blois and David I of Scotland, who had espoused the cause of Empress Matilda.
He then called a legatine council of all the bishops and abbots of England, which assembled at London, December 1138, and at which eighteen bishops and about thirty abbots were present. The chief business of the council, besides some disciplinary measures, was the election of an archbishop for the See of Canterbury. Thibaut, Abbot of Bec, was chosen, and consecrated by Alberic.
Accompanied by Thibaut and other bishops and abbots, he returned to Rome in January 1139. The same year, Alberic was sent to exhort the inhabitants of Bari, a town on the Adriatic, to acknowledge as their lawful sovereign Roger II of Sicily, against whom they were in revolt.