Hatto (fl.817) was from 806 to 817 the 8th Bishop of Passau.August Leidl: Die Bischöfe von Passau 739–1968 in Kurzbiographien. Verlag des Vereins für Ostbairische Heimatforschung Passau, Passau 1978.Herbert Wilhelm Wurster: Das Bistum Passau und seine Geschichte. 4 Bände, Straßburg 1994-2010.
Hatto was present in 807 on a provincial synod in Salzburg. Provisions on the use of the tenths were adopted.
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