The aim of this paper is to identify the industrial markets coordinates with the help of Herfindahl–Hirschman concentration index, cost disadvantage ratio (CDR) index and Comanor and Wilson's economies of scale index (MES). The paper also attempts to recognize Iran's monopolistic industries through the Fuzzy TOPSIS method presented by Chen (2000) under triangular fuzzy membership function. Given the findings raised from three market structure components (HHI; CDR and MES) it is confirmed that the most monopolistic industries respectively include: Manufacturers of tobacco products, manufacturers of games and toys, manufacturers of industrial process control equipment and tanning and dressing of leather, manufacturers of luggage, handbags, saddlery and harness, dressing and dyeing of fur. The Entry barrier criterion has also had an essential role in expanding the monopolies in Iranian markets
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