Conflict of laws is one of the most complex issues in international law, which is most evident in family relationships between people from different countries.This issue becomes particularly important when both parties in an international relationship are subject to different legal systems.One of the main issues that faces many challenges in this field is dowry,which is recognized as a legal right for women in Iran,but in many Western countries, including the United States,it is treated with a fundamentally different concept.The main purpose of this research is to analyze the conflict of dowry laws in the legal systems of Iran and the United States.The research method is descriptive-analytical in terms of purpose,application,and method.By referring to various sources, using the tool of record-keeping, the relevant materials were collected and then described and explained the subject. The findings show that dowry is officially recognized in Iranian law, while in the American legal system it is not precisely defined, but rather premarital financial agreements are more common in this country. A foreign court ruling is enforceable in the courts of these two countries when the law governing the nature of the dispute does not conflict with the public order of these two countries. Otherwise,its enforcement will be refused.Since divorce laws in the United States are different, it is expected that each state will apply its own laws in the conflict of laws issue regarding dowry in the United States.Accordingly, the enforcement of dowry in American courts is complicated and to some extent impossible.