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 2,345 inhabitants, the municipal unit of Pylos 5,287. The municipal unit has an area of 143.911 km².
Pylos has been inhabited since Neolithic times. It was a significant kingdom in Mycenaean Greece, with remains of the so-called "Palace of Nestor" excavated nearby, named after Nestor, the king of Pylos in Homer's Iliad. In Classical times, the site was uninhabited, but became the site of the Battle of Pylos in 425 BC, during the Peloponnesian War. After that, Pylos is scarcely mentioned until the 13th century, when it became part of the Frankish Principality of Achaea. Increasingly known by its French name of Port-de-Jonc or its Italian name Navarino, in the 1280s the Franks built the Old Navarino castle on the site.