American sanctions against Iran are one of the most extensive in terms of variety 
and extent . The most approved sanctions are unilateral against a country. While 
unilateral economic sanctions in an extraterritorial manner are considered a 
violation of the sovereignty of other countries in this regard.This research is done 
through analytical-descriptive methodGiri has studied the legal analysis of Iran's 
foreign investment embargo by the United States of America based on reliable 
research documents and international law jurisprudence. The findings of the 
research show that the restrictions caused by the unilateral US sanctions against 
Iran and the increase in investment costs can be considered as a serious obstacle to 
foreign investment in Iran. However, in 1991, the United Nations General 
Assembly strongly urged governments to end unilateral pressures. Also in the 
another one in 1996 called for the removal of such practices under the title 
"Elimination of economic pressure measures as a means of political and economic 
coercion".The American side in sanctioning Iran violates the principle of peaceful 
coexistence among governments, which requires respect for the political principles 
of international law, i.e. the legal equality of governments, non-interference, 
cooperation and friendship, respect for the independence and territorial integrity of 
governments among the members of the international community. This type of 
actions lacks legal and international validity due to the lack of legitimacy.