Although it is well recognized that organizational culture is important for ensuring corporate sustainability, most existing models on an organizational culture do not have a sustainability-oriented organizational culture. While a few models about sustainability organizational culture are available, they focus on a particular aspect of the sustainability organizational culture (e.g., strategy, practice). To fill in the gap in the literature, the present study aims at developing a sustainability organizational culture model. It identifies components of a sustainability organizational culture, develops an Integrated Sustainability Organizational Culture model, and explores the model by adopting the case study approach, mixed data collection methods, and the working analytical framework. As an empirical contribution, findings indicate that, through a widely shared organizational culture, the sustainability organizational vision and values drive emotionally committed organizational members to perform corporate sustainability practices that lead to enhanced Triple Bottom Line outputs, satisfied stakeholders, and brand equity. As a theoretical contribution, the empirically endorsed Integrated Sustainability Organizational Culture model provides directions for further theoretical development. Managerial implications are discussed.