Friedrichstein may refer to:

  • Friedrichstein, former German name of Gęsiniec, a village in Poland
  • Friedrichstein, Gottschee German name of Fridrihštajn [sl], a mountain peak and former castle of the Blagaj family in Kočevje, Slovenia
  • Friedrichstein Palace, a former palace near Königsberg in East Prussia, main seat of the Dönhoff family