The principle of unity of nationality in Iranian, Britain law and international Conventions

Marrying Foreigners is one of the very important issues of private international law in each country. In this case, the main question is performing the principle of unity of nationality or multiple nationalities of couples? With regard to United Kingdom of Great Britain and Northern Ireland nationality laws, it seems Iran is one of the countries which are still performing Principle of Unity of nationality of couples, while the other countries like the U.K are performing Principle of Independent of nationality of couples. However, it seems that Principle of Unity of nationality is not sufficient of circumstances existing today in Iran. In compare with legally developed countries, Iran needs to have a more precise review on the law of its nationality laws. In this research along investigation about the approach of Iran, and United Kingdom of Great Britain international conventions to unity of nationality, mentioned to practical problems of this principle for Iranian citizens.