Greek Socialist Party (Greek: Ελληνικό Σοσιαλιστικό Κόμμα) was a Greek political party founded by Gerasimos Arsenis when he left Panhellenic Socialist Movement on April, 1987. Among his members were the unionists and , and . The party expressed those who were dissatisfied with the stabilization program of 1985-1987 of Costas Simitis. He took part in the election of June, 1989 and gained 0.21%. 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.