Language in the field of nationality. It is one's commitment to the legal behavior, which requires one to be truthful, honest and straightforward in dealing with others. It also requires the absence of any intention to forge, or to cheat or to harm the others. It is an idea that has a subjective content.

The research examines the idea of "good faith" in the field of nationality in the light of the settled general rules of comparative law, and the extent to which it is possible to consider some of the texts of the UAE nationality law as applications of this idea. Analyzing some of the Emirate nationality law shows that it has given the idea of good faith its due importance. This is clear at the state level when the government sets the rules regulating the nationality. It is also evident at the level of the individual behavior when people acquire, lose or prove their nationality.

It is equally clear concerning the others who deal with the holder of this nationality when there is a change in his legal position.

This study considers analytical and documentary to the texts of the nationality law of the United Arab Emirates in the light of the comparative law. It consists of two chapters and a conclusion.

Chapter One: The concept Of good faith. Chapter Two: Applications of the idea of good faith in the field Of the UAE nationality. The conclusion gives the main findings and the recommendations of the research.

Throughout this research, it is clear that the UAE nationality law includes many applications of the principle of good faith according to the comparative laws. Some of these are related to the system of the State itself, and some are imposed on the individual in order to be committed not to falsify or to forge in the required nationality documents, otherwise the UAE nationality will be drawn back from him. He has to behave properly in proving the nationality. The UAE nationality law includes principles which protect the others who have good faith and who deal with the holders of the UAE nationality when activating the idea of back effect regarding nationality laws.