Linguists only infrequently pay attention to urban linguistic diversity, that is, to the actual environment in which most linguistic research is conducted. However, in recent decades cities have become the main hub of population and languages. There are no readily accessible answers even to the simplest questions, such as how many languages are spoken in a certain city. Modern cities, particularly megacities, can be viewed as a special kind of linguistic area. The new research field of urban linguistics is gradually being formed. Moscow, as the only megacity in Russia, calls for special attention by researchers.
Key words: urban linguistics, metropolis, language area, linguistic diversity