Schladminger Gletscher, Alpine glacier in Obertraun, Austria.

Schladminger Gletscher is the third-largest glacier of the Dachstein massif, a broad ice field that in 1850 covered 2.163 km² and by 2015 only about 0.680 km². It has no pronounced tongue: at its 1850 maximum it ended in a wide front whose meltwater ran above ground for several hundred metres before sinking into dolines and karst hollows. Its lowest point lay at roughly 2540 m in 2018, and it now shows almost no flow.

Around 1850 the glacier reached its last maximum, covering 2.163 km²; by 2015 only about 0.680 km² remained, a loss of more than two thirds. Friedrich Simony described it in the mid-19th century as largely free of crevasses, except on the roughly 45-degree slope toward the Großen Koppenkarstein. At that maximum it ended in a broad front without a pronounced tongue, and its meltwater ran above ground for several hundred metres before sinking into dolines and karst hollows.

The name Schladminger Gletscher refers to the market town of Schladming, 9.1 km to the south. On the plateau around the ice lie alpine pastures that old maps name Zlacken (Lackenmoosalm), Langkaralm, Gjaidalm, Taubenkaralm, Schönbichlalm and Modereckalm. A local legend, the Sage von der übergossenen Alm, tells of herders who grew so prosperous from milk that they bathed in it and paved their floors with cheese, until the pastures were buried under ice.

The Dachstein-Südwandbahn, opened in 1969, runs from the Türlwandhütte (1692 m) to the Hunerkogel (2687 m), giving access to the glacier area. The lowest point of the ice lay at about 2540 m in 2018, at the valley station of the former Schladminger lift. The glacier has almost no flow movement left, and its connection to the Hallstätter Gletscher at the Gjaidsteinsattel tore apart in summer 2025.

Southeast of the glacier, at 2,040 m in the long Brunngrube kar, a late Bronze Age settlement was found in 1996; radiocarbon dating gave it an age of 3,385 years. Similar finds are known from other glacier forefields.