Supplier Relationship Management is very important for manufacturing firms as it can ensure the supply of reliable and frequent deliveries in today's dynamic and competitive environment. For such relationship to be effective and long-term, it has to be beneficial for all parties, the buying and the supplier firms. This study attempts to examine the impact of supplier relationship management (SRM) on competitive performance in the manufacturing sector.Based on the literature review, we measure SRM through five main practices: supplier quality improvement, trust-based relationship with suppliers, supplier lead time reduction, supplier collaboration in new product development, and supplier partnership/development. We measure competitive performance through cost, quality, flexibility, delivery, and on time product launch.Using international data collected in Japan, Korea, USA, and Italy as part of round 3 of High Performance Manufacturing (HPM) project, and After using statistical package of social sciences (SPSS) to describe and analyze the data, the results show that two practices of supplier relationship management, supplier partnership/development and supplier lead time reduction significantly and positively affect the competitive performance of the buying firms. Discussion and conclusion are provided based on the results of this study.