Ortenburg (Central Bavarian: Otnbuag) is a municipality and old market town in the district of Passau in Bavaria in Germany.

The closest municipalities are Haarbach, Beutelsbach, Vilshofen an der Donau, Fürstenzell, and Bad Griesbach im Rottal.

During the height of their power, during the twelfth and thirteenth centuries, the Ortenburgs held lands from as far south as the Brixen valley, that extended also far into the Upper Palatinate.

Smuggling across the border Bibles (Martin Luther) to Habsburg: Hans Ungnad von Weißenwolff, Freiherr von Sonneck, Hans III (1493–1564), famous Bible printer and smuggler in Bad Urach[4] Smuggler, translator and Slovene refugee Protestant preacher Primož Trubar, who published the first books in Slovene and is regarded as the key consolidator of the Slovene identity, lived in Tübingen Derendingen.

The Mostbauern of Ortenburg (orchard meadow farmers) came as grower and cellar master protestant refugees from Austria.