Abstract: The subject of this research is the analysis of the concepts of “time” and “space” in S. N. Trubetskoy’s concrete idealism. The object of this research is the Russian religious philosophy of the XIX-XX centuries. The author examines such aspects of the topic as the origin of temporal concept of S. N. Trubetskoy on the background of German idealism, English empiricism, positivism and voluntarism; substantive innovations introduced by the Russian philosopher into interpretation of these concepts; as well as the question of the feasibility of their implementation in realization of the gnoseological principle of “universal compatibility of all that exists”. The author applies the traditional set of methods: philosophical reconstruction, system-structural analysis, hermeneutic and comparative methods. The following conclusions are made: space and time in the views of S. N. Trubetskoy have a real ideal nature of manifestation, which differs his approach from Kant’s and Solovyev’s; being the forms of sensuality, they, on the one hand, “really” substantiate the unity of the world, and on the other – “ideally” present to the consciousness things in their diversity. The author’s special contribution into this research consists in the systemic analysis of dialectical approach of S. N. Trubetskoy in conceptualization of space and time. The similar specialized research dedicated to S. N. Trubetskoy’s concrete idealism has not been previously conducted.