Estanislau Ruiz Ponsetti, or Estanislau Ruiz i Ponsetí in Catalan (23 June 1889 – 1967), was a Spanish engineer and socialist politician who became one of the leaders of the Unified Socialist Party of Catalonia (Partit Socialista Unificat de Catalunya, or PSUC).

[1] Ruiz joined the Socialist Union of Catalonia (Unió Socialista de Catalunya).

[2] After the outbreak of the Spanish Civil War (1936–1939) Ruiz supported the formation of the PSUC in July 1936.

[1] In the government of the Generalitat de Catalunya named by President Lluís Companys on 31 July 1936 the PSUC was given three ministries.

[3] On 13 August 1936 Ruiz was appointed PSUC representative on the Economic Council of Catalonia.

[4] In June 1937 he became an adviser to Joan Comorera, who was again Minister of the Economy and in July 1937 he joined the PSUC Central Committee.

[2] Under Ruiz some of the Spanish enterprises that had been collectivized by the workers were either taken over by the state or returned to their original owners.

... And so since our Russian comrades, after long years of war communism followed by misery and hunger, finally arrived at the N.E.P.