The article deals with the comprehension of the concept of reality in the cultural and scientifi c heritage of the French enlightener Denis Diderot. The interest to this topic is dictated by the timeless relevance of the innovative dramaturgical theory of the thinker, in which the issue of depicting the real is central. In the course of the analysis the works of domestic and foreign philosophers and literary critics, who touched upon the problem of the representation of reality in the 18th century and especially in the works of Denis Diderot, were involved.