The study deals with the attitude of Russian liberals of the early 20th century to the Eastern question, which occupied a special place in international politics and whose aggravation became one of the factors leading to the World War I. Various political forces in Russia developed their own variants of its solution, realizing that the fate not only of the country, but of the whole world largely depended on the projects they proposed. The analysis of the liberals’ ambiguous perception of the Russian government’s actions in the Balkans, their attitude to the South Slavs, to the problem of the Black Sea Straits, and to the confrontation between the great powers united in alliances, i.e. all aspects of the Eastern question, will allow us to reconstruct and understand the liberals’ understanding of the connection between foreign policy and Russia’s internal development, national interests, and ideological values. Looking at the views of the liberals of the early 20th century on the Eastern question reveals not only the peculiarities of its perception by the ruling elite and representatives of the legal opposition, but also the roots of the growing alienation of the country’s elite from the people. It was this alienation, which intensified during the war years and manifested itself, among other things, in the different perceptions of the importance of the Eastern question by the authorities, the liberals, and the people, that led to the fall of the first liberal Provisional Government in the spring of 1917. As a result, the people tired of the war and unable to understand the meaning of Russia’s struggle for foreign lands, came to support the Bolsheviks, who exposed the “imperialist plans” of the Provisional Government and advocated peace without annexations and contributions. The paper touches upon the problem of the liberals’ attitude not only to the government’s foreign policy, but also to Russian statehood, the conceptual reasons for their transition from a restrained peace-loving position and the desire to prevent war to its unconditional support. The authors identify the ideological and foreign policy factors that influenced this liberal transit. The main attention is paid to the understanding of representatives of various liberal movements of the Eastern question, which, without exaggeration, took a central place not only in their foreign policy program, but also in the project of internal transformations, which envisaged the creation of Great Russia as a result of its solution. The study identifies and analyzes the innovations introduced by the liberals in the interpretation of the Eastern question under the influence not only of the changing international situation, political and economic modernization of Russia, which was becoming a “Duma monarchy,” but also of the development of the ideology itself; the peculiarities of its perception by representatives of various liberal currents in the country are examined.