Oligyrtos (Greek: Ὀλίγυρτος) is a mountain located at the junction of Arcadia, Corinthia and Argolis in the northeastern Peloponnese in Greece.

Neighboring mountain ranges are Kyllini (Ziria) to the north, Mainalo to the southwest, Trachy to the south and Chelmos (Aroania) to the northwest.

Pine trees and barren lands are found in higher areas.

It is drained towards the Lake Stymphalia to the north, and towards the plain of Kandila to the south.

In antiquity, the fortress Oligyrtus was located in a pass on the mountain.