Reichenau Abbey was a Benedictine monastery on Reichenau Island in southern Germany, founded in 724 by Saint Pirmin. Its patrons included Charles Martel and the Alemannian duke Hnabi. Pirmin left in 727 after a conflict with Hnabi. The article names no architect or style. UNESCO listed the Monastic Island of Reichenau in 2000.
Bishop Egino built the parish church of St. Peter at Niederzell in 799, described as a small Roman basilica with two towers. The abbey housed a school, a scriptorium and an artists' workshop. The article credits it as a major center of manuscript illumination in the late 10th and early 11th centuries, known as the Reichenau School. Abbot Berno led its peak period, from 1008 to 1048.
After secularization, dated 1757 initially and 1803 permanently, parts of the library went to Karlsruhe and Munich. Since 2001, a small Benedictine community has been re-established at Niederzell.

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