The Social Democratic Party (, abbreviated PSD) is a center-left Nicaraguan political party that split from Conservatives in 1979. The party sought affiliation to the Socialist International, but its application was rejected.West Coast Trade Union Delegation to Nicaragua (U.S.). Nicaragua, sindicatos, democracia, y la lucha por la paz. Oakland, CA: Red Sindical sobre Centroamérica, 1986. p. 14
The PSD abstained from 1984 elections. As of 2006, the PSD was in an electoral alliance with the Constitutionalist Liberal Party (PLC).
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