Hermannskogel

Infobox Mountain
Name = Hermannskogel
Photo = Hermannskogel von der Rohrerwiese.jpg
Caption = Hermannskogel from Rohrerwiese
Elevation = convert|542|m|ft|0
Location = Vienna, Austria
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Coordinates = coord|48|16|N|16|17|E|type:mountain_region:AT|display=inline,title
Topographic
Type=| Age=
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Hermannskogel, a mountain in Vienna, is Vienna's highest point. It forms a part of Vienna's border with Lower Austria. Three kilometres east of Hermannskogel are the Kahlenberg and Leopoldsberg. It was here in 1683 that the relief army from Poland ended the Second Turkish Siege of Vienna.

Hermannskogel is an important geodetic basepoint, Its coordinates were fixed by geodetic network adjustment in 1892, as the geodetic basis of the triangulation of the Habsburg Empire. The network therefore is called Hermannskogel 1892 datum, or, by other terms MGI datum as the geodetic works were carried out by the Militär-Geographische Institut, Vienna. This datum is used nowadays in Austria, and also, with different longitude reference, in the post-Yugoslav countries.