Pylos, historically also known as Navarino, is a town and a former municipality in Messenia, Peloponnese, Greece. Since the 2011 local government reform, it has been part of the municipality Pylos-Nestoras, of which it is the seat and a municipal unit. It was the capital of the former Pylia Province. It is the main harbour on the Bay of Navarino. Nearby villages include Gialova, Pyla, Elaiofyto, Schinolakka, and Palaionero. The town of Pylos has 2,568 inhabitants, the municipal unit of Pylos 4,559 (2021). The municipal unit has an area of 143.911 km2.

Messenia or Messinia is a regional unit in the southwestern part of the Peloponnese region, in Greece. Until the implementation of the Kallikratis plan on 1 January 2011, Messenia was a prefecture (nomos) covering the same territory. The capital and largest city of Messenia is Kalamata.