{{Short description|Municipal unit in Greece}} {{hatnote|Poseidonia is also the ancient Greek name of Paestum. In the myth "The Gift of Athena", Poseidonia is a candidate name for Athens.}} {{Infobox Greek Dimos |name = Poseidonia |name_local = Ποσειδωνία |type = municipal unit |image_map = DE Posidonias.svg |map_caption = Location within the regional unit |periph = South Aegean |periphunit = Syros |municipality = Syros-Ermoupoli |pop_municunit = 4114 |pop_community = 967 |population_as_of = 2021 |area_municunit = 23.7 |elevation = |coordinates = {{coord|37|23|N|24|53|E|format=dms|display=inline,title}} |postal_code = |area_code = |licence = EM |mayor = |website = |image_skyline = |caption_skyline = |party = |since = }} '''Poseidonia''' ({{langx|el|Ποσειδωνία|Posidonía}}, named after Poseidon) is a village and a former municipality on the island of Syros, in the Cyclades, Greece. Since the 2011 local government reform it is part of the municipality Syros-Ermoupoli, of which it is a municipal unit.<ref name=Kallikratis>{{Cite web|url=http://www.et.gr/idocs-nph/search/pdfViewerForm.html?args=5C7QrtC22wGYK2xFpSwMnXdtvSoClrL81-32jgAMSfbnMRVjyfnPUeJInJ48_97uHrMts-zFzeyCiBSQOpYnT00MHhcXFRTsb2fGphpq4MKX2ZkaHobySNnvZCNHXvYVvlf80XevW0Q.|title=ΦΕΚ B 1292/2010, Kallikratis reform municipalities|language=el|publisher=Government Gazette}}</ref> The population was 4,114 inhabitants at the 2021 census, and the land area is 23.705 km².<ref name=stat01>{{cite web|url=http://dlib.statistics.gr/Book/GRESYE_02_0101_00098%20.pdf|publisher=National Statistical Service of Greece|title=Population & housing census 2001 (incl. area and average elevation)|language=el}}</ref> The municipal unit shares the island of Syros with the municipal units of Ano Syros and Ermoupoli. It is also known as ''Dellagrazia'' (name taken from a small church of Maria della Grazia).
==References== {{Reflist}}
{{Syros-Ermoupoli div}}
Category:Populated places in Syros
{{SouthAegean-geo-stub}}