Denkmal für die Gefallenen des Feldzugs von 1866, War memorial in Koblenz, Germany.

The Denkmal für die Gefallenen des Feldzugs von 1866 is a tuff stone obelisk standing on a cube-shaped pedestal with three inscription plates recording 489 soldiers from different regiments. The structure sits on Glockenberg in the Asterstein district and offers direct views of Clemens Square, the Electoral Palace, and the Rhine riverbank.

The memorial was approved by cabinet order in 1867 and honored Prussian soldiers who fell during the German War of 1866, particularly at Langensalza and Koeniggraetz. Officers of the Prussian VIII Army Corps commissioned Cologne sculptor Christian Mohr to design it.

The memorial was designed by Cologne cathedral sculptor Christian Mohr, with stonework by master mason Grot of Brohl, inscription plates by Wiehl of Neuwied and reliefs from the Cologne Cathedral workshop. Until the 1920s veterans of the 1866 war met here for reunions, when the surroundings were laid out as a garden.

The memorial is best reached from Glockenberg and is easily oriented from Clemens Square. Since 2019 it has been illuminated at night, which helps when exploring the surrounding Fort Asterstein area.

The obelisk's original crowning cross, a stone copy of the 1866 campaign commemorative cross, was lost in the Second World War and never replaced. A restoration in the late 1970s patched damage with artificial stone, but the top and parts of the inscriptions remain missing. Since 2019 the monument has been lit at night as part of the Fort Asterstein park.