The purpose of this quantitative correlational study was to identify relationships between organizational culture types, supply chain integration, and firm performance. The study process included obtaining data from 201 supply chain professionals and procurement specialists working in various companies throughout the United States. Supply chain integration data and firm performance derived from results obtained from participants completing a 5-point Likert-type scale survey. The Organizational Culture Assessment Instrument helped with determining organizational culture types. The results revealed a significant correlation between supply chain integration and firm performance. All three integration variables, customer, supplier, and internal had a significant positive correlation with total integration and firm performance. The data also indicated that supply chain integration increased when organizational flexibility was present. An unexpected result was both clan and adhocracy cultures had a significant correlation to supply chain integration and firm performance. Conducting this study and revealing the findings added to literature and informs supply chain practitioners by determining the influence of organizational culture on supply chain integration performance. The results of this study substantiate that a flexible organizational structure, as shown in the clan and adhocracy cultures, increases supply chain integration and firm performance. As competitive forces intensify, the need for firms to develop a flexible organizational structure to leverage supply chain integration practices will increase. The results of this research could provide organizational leaders more insights into increasing supply chain integration efforts and improved firm performance through flexible culture alignment.