William of Auberive (French: Guillaume d'Auberive) was a Cistercian monk and numerologist who served as the abbot of Auberive [fr] from 1165 until 1186.
[1] Two of William's treatises—De sacramentis numerorum a ternario usque ad duodenarium and Regule arithmetice—and three of his letters have been published.
His De sacramentis on the numbers three (3) through twelve (12) is a direct continuation of the Analytica numerorum of Odo of Morimond on the first three natural numbers.
It was itself followed by the work of Geoffrey of Auxerre, beginning with thirteen (13).
He knew the De arithmetica of Boethius and was especially interested in perfect numbers.