Reichenau Abbey was a Benedictine monastery on Reichenau Island (known in Latin as Augia Dives) in southern Germany. It was founded in 724 by the itinerant Saint Pirmin, who is said to have fled Visigothic Spain ahead of the Moorish invaders, with patronage that included Charles Martel, and, more locally, Count Berthold of the Ahalolfinger and the Alemannian duke Hnabi. Pirmin's conflict with Hnabi resulted in his leaving Reichenau in 727.

Reichenau quickly developed into an influential religious, cultural, and intellectual center. Under Abbot Haito the monastery began to flourish. It gained influence in the Carolingian dynasty, under Abbot Waldo of Reichenau (740–814), by educating the clerks who staffed Imperial and ducal chanceries.