The sources of administrative law are the fundamental concepts from which administrative law starts Law. Throughout history they have developed, and rest on basic sources according to which the law was based, from common law, court practice and international law as created legal frameworks according to which applied a pattern of behavior and legal treatment in the relationship interpersonal relations and protection of property legal relations. Here it will be shown how the sources of administrative law depend on each other about each other, how important is their role in the expansion of legal norms, both materially and formally, and implementation of customs, customary law, international law and others from which later developed a number of legal branches that are applied today in judicial practice when deciding in administrative procedures or administrative disputes. Sources of administrative law, as the creation of discipline in administrative law, they include laws, secondary legal acts, court precedents, customs and doctrine. All these elements as a whole form the basis for the adoption of I. application of administrative decisions and procedures. Thus, formal and material sources of administrative law, through the hierarchy of legal acts, which must respect the principle of legality. Also, through the procedure administrative court, regular and extraordinary legal remedies, and court rulings the complexity of administrative law and the application of administrative sources will be seen rights in specific cases. Also, sources of administrative law are fundamental legal values that are implemented in the legal system international organizations, community of states.