Supplier selection is one of the most important steps of supply chain management, and choosing the right supplier is of great importance in achieving the goals of the companies under competitive conditions. In this study, the supplier selection problem in a company operating in the logistics sector is discussed. Firstly, critical spare parts have been selected by FSN (Fast-Slow-Non-Moving) analysis in order to determine the product group from which supplier selection would be made. Axiomatic Design and Dematel (The Decision Making Trial and Evaluation Laboratory) method, which are among the Multi-Criteria Decision Making (MCDM) techniques, have been proposed to solve the problem. The relationships between the criteria influencing the supplier selection have been interpreted via Dematel and the criteria have been divided into two groups as “dispatcher” and “receiver”, and selection and ranking among the suppliers have been carried out with Axiomatic Design. In addition, considering the fact that the criteria do not have equal weight, the criteria have been weighted by the Analytical Hierarchy Process (AHP) method and the ranking obtained by Weighted Axiomatic Design have been compared with the previous ranking. Finally, the criteria determined as “receiver” in the Dematel method have been removed from the analysis and the methodology has been repeated. Thus, the effect of determining the cause-effect relationship between the criteria on the results has been interpreted.