The main objective of the study was to investigate the supply chain integration and its effect on Operational performance of East African Bottling Share Company Bahirdar Plant. Explanatory research design with quantitative research approach was employed. The study primarily aimed to gather data from 84 managers and supervisors. The selection of the respondents was based on census technique. The quantitative data collected through questionnaire instrument was analyzed using descriptive and inferential statistics. Moreover, descriptive statistics was used to present the result. In addition, the study also used multiple linear regression test was used to evaluate the significant supply chain integration factors affecting firm performance. Based on the questionnaire data, the study concluded that the supply chain integration accounted for 85.6 % of variance in firm performance. In connection, the study also concluded that supplier integration, internal integration and customer integration affected firm performance positively and significantly. Furthermore, the study concludes internal integration was the best predictor of firm performance by contributing 40.2% of the change in the level of performance. Based on the conclusions the study recommends, for the company to focus on customer and internal integration and to create healthy relationship among the company and stakeholders.