© 2022 Old City Publishing, Inc.Glass fiber Reinforced Polyester (GRP) pipes are extremely important for Turkey due to the irrigation activities in the Southeastern Anatolia Project (GAP). Because of the high demand for GRP pipes in the project region, new production plants are needed. Site selection of a GRP pipe production plant in the GAP project region is considered in this study. The main aim of this study is to develop a scientific approach for site selection of the new GRP pipe production plant. Importance degree of criteria was calculated by using Fuzzy Analytic Hierarchy Process (FAHP) method. Alternative locations for GRP pipe plant in Southeastern Anatolian Region of Turkey were found by Geographical Information Systems (GIS), and then ranking of alternative places was obtained by Fuzzy VIše Kriterijumska Optimizacija I Kompromisno Resenje (VIKOR) method. According to the proposed method, Oğuzeli / Gaziantep was determined as the most appropriate location.