The Socialist Workers Party in Greece (Greek: Σοσιαλιστικό Εργατικό Κόμμα, ΣΕΚ; translit.

While in London they developed relations with the International Socialists led by Tony Cliff and were won to the politics of the IST.

In the early 1980s, the OSE developed closer links with the IST, grew fairly rapidly and in 1997 changed their name to the Socialist Workers Party.

SEK publishes a weekly newspaper, Workers Solidarity (Εργατική Αλληλεγγύη), and a bi-monthly magazine, Socialism from Below (Σοσιαλισμός από τα Κάτω).

The SEK is active in a number of organisations, including the Greek "Stop the War Coalition", "United Against Racism and the threat of Fascism".