While enhancing the competencies of enterprises, outsourcing facilitates flexible structures for enterprises. One of the critical challenges faced by purchasing managers is the selection of strategic suppliers. In this study, fuzzy logic system was constructed to solve multi period dynamic decision making for strategic supplier selection with stochastic demand. The results of the proposed system showed that, fuzzy logic based dynamic strategic supplier selection system can help the decision maker (buyer) to select strategic supplier more effectively and simply since fuzzy logic based systems are well suited approach when working with uncertain parameters. (C) 2014 The Authors. Published by Elsevier Ltd. Selection and peer review under responsibility of Organizing Committee of BEM 2013.