In this paper we present the structure of Georgian-Modern Greek Dictionary of Idioms. This is a first attempt in Georgian Lexicography to compile a dictionary of that type. It has been compiled within the framework of the project of the Presidential Grant for Young Scientists financed by the Foundation for Georgian Studies, Humanities and Social Sciences (Shota Rustaveli National Science Foundation). The paper reports on the results of the project (in other words the compilation of the dictionary, which consists of 11801 idiomatic expressions), methodological principles, the main features, the macrostructure and the microstructure of the dictionary. The compilation of the Georgian-Modern Greek Dictionary has a practical value for a wide range of readers.