This study examines customer perception and service quality at the Reliance Retail Supermarket in Coimbatore City, focusing on how service quality dimensions influence overall customer satisfaction and loyalty. With rising competition in the retail sector, supermarkets are increasingly recognizing the importance of understanding customer expectations and perceptions to deliver superior service experiences. The research employs a quantitative approach, gathering responses from a sample of supermarket patrons through structured questionnaires. Key service quality factors analyzed include tangibility, responsiveness, reliability, assurance, and empathy, based on the SERVQUAL model. Data analysis reveals significant relationships between service quality dimensions and customer satisfaction levels, highlighting that responsiveness and reliability have the strongest influence on shopper perceptions. Additionally, the findings indicate areas where the supermarket performs well— such as store environment and staff courtesy—while identifying gaps in perceived responsiveness and checkout efficiency. The study concludes with practical recommendations for retail management to enhance service quality, strengthen customer loyalty, and improve competitive positioning in Coimbatore’s dynamic retail market. The insights derived contribute to both academic literature and managerial strategies in retail service quality evaluation