Eskihisar (literally "old fortress" in Turkish) may refer to the following places in Turkey :

• Bolu, capital of the northern province of Bolu, Ancient Claudiopolis (in Honoriade)
• Eskihisar (Denizli), a village in the central (Denizli) district of Denizli Province
• Eskihisar, (Elmalı), a village in the district of Elmalı, Antalya Province
• Eskihisar (Gebze), a harbour village in Eastern Marmara
• Eskihisar, (Sultanhisar), a village in the district of Sultanhisar, Aydın Province
• Yeni Eskihisar, a stratigraphic formation in Yatağan, Muğla Province

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