The article aims to analyse Bulgaria’s provisions of the laws and international treaties that regulate the use and functioning of languages in the country since the restoration of the Bulgarian statehood at the end of the 19th century to the present day (that is, monarchical, socialist and modern periods). The evolution of this aspect of the Bulgarian national law is analysed depending on the form of government in the particular era of the state’s existence. The article examines Bulgaria’s relations with neighboring Balkan countries throughout their development, including numerous wars, which were primarily based on attempts to solve ethnic problems. Based on the results of the censuses of the population of Bulgaria and Eastern Rumelia, data are provided on the dynamics of the absolute and relative number of Bulgarians and major national minorities and on the number of those who indicated their native languages. The significance of the study is due to the fact that the Balkan Peninsula, although being on the periphery of current processes in the modern geopolitical paradigm, not being their actor and being divided into a dozen states, still played and is playing one of the leading roles in the European and world histories. The study of language legislation, as one of the key elements of language policy, makes it possible to identify a variety of aspects of interethnic relations both in the historical, retrospective and long-term perspective. In addition, the study of this issue may be in demand when considering interethnic conflict situations in other problem areas. The article concludes that the language legislation of Bulgaria is characterized by significant minimalism in comparison with similar aspects of law in many European countries, and the linguistic rights of national minorities in Bulgaria are minimally reflected in the considered laws of the state.