Islamic Nations Party or Party of Islamic Nations (Persian: حزب ملل اسلامی, romanized: Ḥezb-e melal-e eslāmi) was an Islamic leftist armed group with clandestine system short-lived during 1960s. It was initially a secret society active against Pahlavi dynasty in late 1950s. It consisted of middle-class youth, mostly highschool teachers and university students. The organization was reportedly involved in 1963 events and 1965 assassination of Hassan Ali Mansur. However, it is alleged that opening fire on Police before arrest of leading members was its "sole standoff".