Greek Socialist Party for Democracy and Development (ESK) [el] (Greek: Ελληνικό Σοσιαλιστικό Κόμμα για τη Δημοκρατία και την Ανάπτυξη) was a Greek political party founded in April 1987 by Gerasimos Arsenis after his expulsion from the Panhellenic Socialist Movement.

Among his members were the unionists Christos Kokkinovasilis[1] and Dimitris Pipergias, Rovertos Spyropoulos and actress Nora Katseli.

The party expressed those who were dissatisfied with the Economic stabilization program of 1985-1987 of Costas Simitis, Minister of National Economy.

In the European election of 1989 the party received 43,654 votes and gained 0.66%.

A few months later, Gerasimos Arsenis returned to Panhellenic Socialist Movement and the party dissolved.