Vouliagmeni (Greek: Βουλιαγμένη, meaning "sunken") is a seaside suburb and former municipality 20 km south of Athens city centre.

The western half, located between Athinas Avenue and the sea, is covered with pine trees and consists of two peninsulas, Megalo and Mikro Kavouri ("Big Crab" and "Little Crab") that feature sandy and pebble beaches in between rocky shores, luxury hotels (including the Astir Palace Hotel occupying most of Mikro Kavouri), the local high school, the picturesque chapel of "St. George of the crab", two marinas, an aquatic sports club (the "Nautical Club of Vouliagmeni", see below), a sports club (soccer, basketball, volleyball, tennis) and upscale restaurants, taverns and cafeterias on the waterfront.

The Megalo Kavouri is land largely owned by the Church of Greece, which maintains an enclosed, protected pine forest and an orphanage.

Ruins of the Temple of Apollo Zoster have been excavated and can be viewed inside the public Astir Hotel beach.

Other remnants of early human habitation found in Vouliagmeni include Neolithic and Bronze Age building foundations, and a 5th-century BC outpost.

In classical times the area was the Athenian deme of Aixōnídes Halaí (Greek: Αἰξωνίδες Ἁλαί), i.e. the Saltfields of Aixōnē (modern day Glyfada).

The Nautical Club of Vouliagmeni, or "NOV" (Greek: Ναυτικός Όμιλος Βουλιαγμένης, "NOB") was founded by local sportsmen in 1937 and is located on the eastern edge of the Mikro Kavouri, adjacent to the Astir Palace Hotel and overlooking the bay, town and lake.