thumb|right|PSN election posterThe Nicaraguan Socialist Party (Partido Socialista Nicaragüense) is a political party in Nicaragua. Founded in July 1944 by Dr. Mario Flores Ortiz. PSN operated as the official communist party in the country. At the time of its foundation, PSN supported the regime of Anastasio Somoza García. PSN considered that Somoza (nominally a liberal) was an anti-fascist ally.

History

In the mid-1960s the U.S. State Department estimated the party membership to be approximately 250. After the surge of the FSLN (which had its origins in PSN), PSN was gradually side-lined.

In 1967 a group of radicals who opted for armed struggle were expelled. They formed the Socialist Workers Party.

In 1974 PSN joined UDEL.