Eleusis is a suburban town and municipality in West Attica Regional unit in Greece. It is situated about 18 kilometres northwest from the centre of Athens and is part of its metropolitan area. 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.
It is the site of the Eleusinian Mysteries and the birthplace of Aeschylus. Today, Eleusis is a major industrial centre, with the largest oil refinery in Greece as well as the home of the Aeschylia Festival, the longest-lived arts event in the Attica Region.
On 11 November 2016, Eleusis was named the European Capital of Culture for 2021.