The policy of interethnic reconciliation characterizes postwar history of the 20th century and underlies the Euro integration process. The achievement of interethnic reconciliation is considered to be an important element of maintenance of stability and security in the modern world. Working out of this matter is characteristic feature of present state of science, public conscience guided by respect for universal values, European integration and globalization. Although the process is very significant there’s no definition of this matter in majority of encyclopedias and dictionaries that was caused by a relative novelty of the discipline of the peace studies. Interethnic reconciliation is a necessary component of successful peace building that can be encouraged by state structures but should be carried out through institutions of civil society and that consists in lasting transition process from negative (unstable, fragile) peace to positive one (just, lasting and enduring peace), in establishment of reciprocal dialogue, in consent and acceptance of peace settlement terms, in deep reconsideration of bilateral relations, a renunciation of revanche, overcoming of historical myths and negative stereotypes, mutual forgiveness, peace culture education, working out of cooperation projects and having for an object elimination of reasons being at the bottom of confrontation as well as prevention of recurring conflicts. Completion of formation of nations, democratic regime and community of civilizational values are important preconditions for the achievement of interethnic reconciliation.