The Altenburg fortification (German: Abschnittsbefestigung Altenburg) near Heroldsbach is a levelled early medieval[1] fortified position at a height of 362 m above sea level (NHN), about 850 metres northwest of the church in Heroldsbach in the Upper Franconian county of Forchheim in the south German state of Bavaria.

No historical or archaeological information is available for this sector fortification, but pottery finds from the interior of the site date to the Early Middle Ages.

[3] The fortification lies on the southeastern edge of a broad, east-west oriented hill ridge in the forested area of Altenburg.

[4] The east and south sides of the site drop fairly steeply to the valley floor of the Hirtenbach stream which lies at around 80 metres above sea level.

The two vulnerable sides, in the west and north, were protected by what is now a very low semi-circular rampart guarded by a ditch.