Customer Relationship Management (CRM) has emerged as a crucial strategic tool for enhancing marketing performance in the competitive banking sector. The present study examined the role of CRM as a determinant of marketing performance in District Cooperative Banks in Karnataka. The study focused on analysing the impact of CRM practices, customer behavioural factors (such as satisfaction, loyalty, trust, and engagement), and customer retention on marketing performance. A descriptive and analytical research design was adopted, and primary data was collected from 180 bank customers using a structured questionnaire. The data was analysed using SPSS tools, including descriptive statistics, Pearson’s correlation, and simple linear regression analysis. The findings revealed that CRM practices had a significant and positive impact on marketing performance, explaining 61.1% of the variation. Customer behavioural factors also showed a strong positive relationship with marketing performance (r = 0.724), while customer retention significantly influenced marketing outcomes (R² = 0.507). The study concluded that effective CRM implementation enhances customer satisfaction, loyalty, and long-term relationships, thereby improving marketing performance. It also highlighted the importance of digital adoption and customer-centric strategies for the sustainable growth of cooperative banks.