We live in a present in which the issue of national identity is gaining ground. The crisis of immigrants, terrorist attacks, wars for the acquisition of new territories and resources, the compact density of minorities of foreign ethnic groups, living together in the territory of the adopted country, have become real disruptive elements in the national security of states. The purpose of this article is to analyze some aspects of the meaning of national identity, perceived by adolescents, to determine their differences and similarities, depending on the ethnicity of their parents, the language usually spoken in the family, in relation to the state language, to highlights the role of national identity, as an essential element of the feeling of patriotism and national pride, a determining element of state security.