The Party of Democratic Socialism (Greek Κόμμα Δημοκρατικού Σοσιαλισμού), better known by its Greek acronym ΚΟΔΗΣΟ (KODISO), was a left-of centre political party in Greece.
KODISO was founded early in 1979 by Yiangos Pesmazoglou and others who came mostly from the breakup of EDIK in 1978. It existed until 1989 when it dissolved, joining the Coalition of the Left and Progress.
Yiangos Pesmazoglou headed KODISO from 1979 until 1984 when he stepped down and left the party joining New Democracy. From 1984 until 1989, the party was headed by Babis Protopapas.
Other members of KODISO included Virginia Tsouderou and Sotiris Kouvelas.