Supplier performance is one of a core supply chain activity that is influenced by differentrnfactors. The purpose of this study is to assess the factors affecting supplier performance; userrncompany employees perspective of Population services international/Ethiopia (PSI/E) usingrnthe three supplier performance factors (supplier selection, supplier relationship and supplierrnevaluation) with supplier performance. A descriptive and explanatory research design wasrnused to assess the relationship between supplier performance and the three factors of supplierrnperformance. By implementing both simple random and purposive sampling from a total ofrn100 employees based in the organization head office, 67 employees were selected. Structuredrnquestionnaire was used as a research tool for collecting data. From the total questionnairesrndistributed 60 were returned. The collected data was analyzed using both descriptive statisticsrnand inferential statistics such as correlation and linear regression. Based on the findings ofrnthe study, supplier selection and supplier evaluation have significant relationship and affectrnsupplier performance while, supplier relationship has relationship but with insignificantrninfluence on supplier performance. Therefore, PSI/E needs to give due attention for supplierrnselection and supplier relationship as if it wants to get best boost supplier performance. Basedrnon these findings, the study also recommends points that should be considered regarding thernfactors affecting supplier performance