View over the excavation site towards Eleusis and the Saronic Gulf.
|Regional unit:||West Attica|
|Mayor:||Georgios Abatzoglou (SYRIZA, Democratic Left)|
|Population statistics (as of 2011)|
|- Area:||37.06 km2 (14 sq mi)|
|- Density:||807 /km2 (2,090 /sq mi)|
|- Area:||18.455 km2 (7 sq mi)|
|- Density:||1,349 /km2 (3,495 /sq mi)|
|Time zone:||EET/EEST (UTC+2/3)|
|Elevation (min-max):||0–5 m (0–16 ft)|
|Postal code:||192 00|
Eleusis (Greek: Ελευσίνα - Elefsina, Ancient Greek: Ἐλευσίς - Eleusis) is a town and municipality in West Attica, Greece. It is situated about 18 km northwest from the centre of Athens. It is located in the Thriasian Plain, at the northernmost end of the Saronic Gulf. North of Eleusis are Mandra and Magoula, while Aspropyrgos is to the northeast.
Eleusis is the seat of administration of West Attica regional unit. It is best known for having been the site of the Eleusinian Mysteries, one of the most famous religious events of the ancient Greek religion, and the birthplace of Aeschylus, one of the three great tragedians of antiquity. Today Eleusis is a major industrial center, with the largest oil refinery in Greece.
The municipality Elefsina was formed at the 2011 local government reform by the merger of the following 2 former municipalities, that became municipal units:
From as early as 1700 BC up to the 4th century AD, Eleusis was the site of the Eleusinian Mysteries, or the Mysteries of Demeter and Kore. These Mysteries revolved around a belief that there was a hope for life after death for those who were initiated. Such a belief was cultivated from the introduction ceremony in which the hopeful initiates were shown a number of things including the seed of life in a stalk of grain. The central myth of the Mysteries was Demeter's quest for her lost daughter (Kore the Maiden, or Persephone) who had been abducted by Hades. It was here that Demeter, disguised as an old lady who was abducted by pirates in Crete, came to an old well where the four daughters of the local king Keleos and his queen Metaneira (Kallidike, Kleisidike, Demo and Kallithoe) found her and took her to their palace to nurse the son of Keleos and Metaneira, Demophoon. Demeter raised Demophoon, anointing him with nectar and ambrosia, until Metaneira found out and insulted her. Demeter arose insulted, and casting off her disguise, and, in all her glory, instructed Meteneira to build a temple to her. Keleos, informed the next morning by Metaneira, ordered the citizens to build a rich shrine to Demeter, where she sat in her temple until the lot of the world prayed to Zeus to make the world provide food again.
Today, the city has become a suburb of Athens, to which it is linked by the Motorway 6 and Greek National Road 8. Eleusis is nowadays a major industrial area, and the place where the majority of crude oil in Greece is imported and refined. The largest refinery is located on the west side of town.
There is a military airport a few kilometers east of Eleusis. Eleusis Airfield played a crucial role in the final British evacuation during the 1941 Battle of Greece, as recounted by Roald Dahl in his autobiography Going Solo.
The HNMS weather station of Eleusis has an average maximum July temperature of 33.0°C (1958-2001 HNMS) and . The Eleusis phainomenon is not yet completely understood however factors of geomorphology, warm water masses in the summer and warm winds might be responsible for its summer climate. According to Kassomenos and Katsoulis (2006), based on 12 years of data (1990–2001), the industrialization of west Attica, where at least 40% of the industrial activity of the country is concentrated, could be the cause of the warm climate of the zone. According to the Köppen Climate Classification system, Eleusis has a hot-summer Mediterranean climate, abbreviated "Csa" on climate maps.
|Climate data for Elefsina, Greece (1958-1997)|
|Average high °C (°F)||13.0
|Average low °C (°F)||5.4
|Precipitation mm (inches)||48.4
|Source: Hellenic National Meteorological Service|
European temperature record
Eleusis is one of the two Athenian suburbs (the other one is Tatoi) with the highest ever officially recorded temperature in Europe according to the World Meteorological Organization of 48.0°C (118.4°F), on 10 July 1977, by the use of minimum-maximum thermometers. 
- Aeschylus (c. 525 BC/524 BC – c. 456 BC/455 BC), playwright and veteran of the Battle of Marathon
- Stelios Kazantzidis (1931–2001), singer
- Orestis Laskos (1908–1992), director, screenwriter and actor
- Vangelis Liapis (1914–2008), scholar and folklorist
- Theodoros Pangalos (1938– ), politician
- Ioannis Kalitzakis (1966- ), footballer
- Detailed census results 2011 (Greek)
- Tripolitis, Antonia. Religions of the Hellenistic-Roman Age. Wm. B. Eerdmans Publishing Company, November 2001. pp. 16–21.
- Kallikratis law Greece Ministry of Interior (Greek)
- Kassomenos P.A., Katsoulis B.D. (2006). "Mesoscale and macroscale aspects of the morning Urban Heat Island around Athens, Greece". Meteorology and Atmospheric Physics, 94, 209-218.
- Climate Summary for Eleusis, Greece
- "Climatological Information for Elefsina, Greece", HNMS climatological table, web: .
- Europe: Highest Temperature. Arizona State University World Meteorological Organization
- Official website (English) (Greek)