ENConsidering the evolution of the scientific knowledge on the topic the authors define “national business cultures” as a complex interdisciplinary basic phenomenon of modern comparative studies and international entrepreneurship. Using the accepted in the world comparative studies methodology – indicative parameters of national business cultures and considering the authors’ corresponding empirical developments a systematic comparative analysis of the national business cultures of the founding countries of the new cooperation platform in Central and Eastern Europe – the “Lublin Triangle” (Poland, Lithuania, Ukraine) – is carried out. The close similarity and wide complementarity of the national business cultures of these countries are revealed. This is largely predetermined not only by their common, centuries-old history, but also by a number of other institutional and economic factors, as well as natural conditions. The priority sectors and spheres of integration of the three countries are determined both at the interstate level and at the level of the interaction of their business structures. Implementing this approach will ensure an increase in the competitive positions of Poland, Lithuania, and Ukraine and, as a result, the Lublin Triangle as a whole, in the system of the modern international division of labor. Based on the similarity and complementarity of the national business cultures, a group of other countries of Central and Eastern Europe (Latvia, Estonia, Slovakia, Romania, and Bulgaria) was selected. Under certain conditions, they could also become members of the Lublin Triangle, which would further strengthen and develop the European Union. Keywords: national business cultures, comparative analysis, Lublin Triangle, Central and Eastern Europe, Poland, Lithuania, Ukraine, entrepreneurship, international integration, European Union. [From the publication]