Triva Redoubt, Fortified tower in Ingolstadt, Germany

Turm Triva is a classical fortress building of the Ingolstadt state fortress, serving as the eastern flank tower of the Reduit Tilly. Its elongated oval layout measures 50 by 79 metres around an inner courtyard, with walls up to 4 metres thick. The exterior design is largely by Leo von Klenze, and the building originally had 58 gun casemates on two levels.

Construction of the redoubt began in 1828 and was completed in 1841, during a period of intensive military development in Bavaria. This era saw the modernization of Bavarian defensive systems according to new technological standards.

The tower is named after Johann Nepomuk von Triva, a Bavarian general and war minister. Since 19 December 2011 it has housed the Bavarian Police Museum, whose exhibits trace the history of law enforcement in Bavaria. Visitors can also look for the 26 lion-head gargoyles on the cornice above the courtyard of the neighbouring Reduit Tilly, carved by Munich sculptor Ernst Mayer, who also made the Medusa head once above the tower's portal.

The tower stands in the Klenzepark on the southern bank of the Danube, opposite the old town; the park paths lead directly to it. The oval structure encloses an inner courtyard, and the walls are up to 4 metres thick. The Bavarian Police Museum has occupied the building since 19 December 2011.

The Medusa head that once sat above the portal was carved by Munich sculptor Ernst Mayer, who also made the 26 lion-head gargoyles on the cornice above the Reduit Tilly courtyard. It disappeared during renovation and has not been found since.