Flaccus Albinus Alcuin (about 735 - May 19, 804) was a monk from York, England. He was related to Willibrord, Anglo-Saxon missionary to the Frisians and the first bishop of Utrecht, whose biography he afterwards wrote.

Alcuin of York had a long career as a teacher and scholar first at the school at York and lastly as Charlemagne's leading advisor on ecclesiastical and educational affairs. From 796 until his death he was abbot of the great monastery of St. Martin of Tours.

He was educated at the cathedral school of York, under the celebrated master Ethelbert of York, with whom he also went to Rome seeking manuscripts. When Ethellbert was appointed Archbishop of York in 766, Alcuin succeeded him in the headship of the episcopal school. He again went to Rome in 780, to fetch the pallium for Archbishop Eanbald I of York, and at Parma met Charlemagne. Charlemagne persuaded him to come to his court and gave him the possession of the great abbeys of Ferrieres and Saint-Loup at Troyes.

From 782 to 790, Alcuin had as pupils the king of the Franks, his kinsmen, the young men sent for their education to the court, and the young clerics attached to the palace chapel; he was the life and soul of the Academy of the palace, and we have still, in the Dialogue of Pepin (son of Charlemagne) and Alcuin, a sample of the intellectual exercises in which they indulged. One surviving tool of the drive to reform education is Charlemagne's circular letter De Litteris Colendis, "On the Study of Letters", which Alcuin wrote.

In 790 Alcuin went back to his own land, to which he had always been greatly attached, and dwelt there some time; but Charlemagne invited him back to help in the fight against the Adoptionist heresy, which was at that time making great progress in northern Spain. At the Council of Frankfurt in 794, Alcuin upheld the orthodox doctrine, and obtained the condemnation of the heresiarch Felix of Urgel. After this victory he again went back to his own land, but on account of the disturbances which broke out there, and which led to the death of King Ethelred (796), he left it forever. Charlemagne had given him the great abbey of St Martin at Tours, where he was to pass his last years.

He made the abbey school into a model of excellence, and many students flocked to it; he had many manuscripts copied, the calligraphy of which is of outstanding beauty. He wrote many letters to his friends in England, to Arno, bishop of Salzburg, and above all to Charlemagne. These letters, of which 311 are extant, are filled mainly with pious meditations, but they further form a mine of information as to the literary and social conditions of the time, and are the most reliable authority for the history of humanism in the Carolingian age. He also trained the numerous monks of the abbey in piety, and it was in the midst of these pursuits that he died. Alcuin is the most prominent figure of the Carolingian Renaissance, in which three main periods have been distinguished: in the first of these, up to the arrival of Alcuin at the court, the Italians occupy the central place; in the second, Alcuin and the Anglo-Saxons are dominant; in the third, which begins in 804, the influence of the Visigoth Dutch magazine for English literature.