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, Nusaybin, a village in the district of Nusaybin, Mardin Province Eskihisar, Sultanhisar, a village in the district of Sultanhisar, Aydın Province Yeni Eskihisar, a stratigraphic formation in Yatağan, Muğla Province