Olsnitz, Ölsnitz or Oelsnitz may refer to:

• Olsnitz, German name for Murska Sobota, a city in northeastern Slovenia
• Oelsnitz, Vogtland, in the Vogtlandkreis district, Saxony, Germany
• Oelsnitz, Erzgebirge, in the district of Stollberg, Saxony, Germany
• Oelsnitz, a village in Lampertswalde municipality, Meißen district, Saxony, Germany
• Kreis Oelsnitz, a former Landkreis in Bezirk Karl-Marx-Stadt, East Germany (1952–1996)

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