Ettehadiyeh-ye Sendika-ye Kargaran-e Iran (Persian: اتحادیه سندیکای کارگران ایران‎, known by its acronym 'اسکی', ESKI) was a trade union centre in Iran. It was founded on the initiative of the Ministry of Labour and Propaganda in September 1946, with the explicit purpose of competing with the Tudeh-led Central United Council of the Trade Unions of Workers and Toilers of Iran (CUC). The task of setting up ESKI had been delegated to Mehdi Sharif-Emami, the director of the Dispute Settlement Department of the Ministry of Labour and Propaganda. ESKI published the newspaper Kargaran-e Iran. ESKI was a founding member of the International Confederation of Free Trade Unions.