Eski Kermen or Eski-Kermen (Ukrainian: Ескі-Кермен; Russian: Эски-Кермен) was a cave town and fortress in the Crimea in the south of Ukraine.

[1] The fortress was built on a plateau of about 1 km by 200m.

The military importance of the place disappeared after the Khazars had conquered it, but it remained a thriving cave dwelling until at least the 11th century, during the rule of the Pechenegs.

It seems to have been deserted in the 14th century, under the rule of the Tatars.

Nowadays, most surface structures have disappeared and only some 400 cave rooms remain.