This study explores the relationship between service quality and customer loyalty in the restaurant industry, specifically focusing on McDonald's. It examines various ways in which McDonald's improves service quality to attain customer loyalty within a short period of time. The study also discusses effective methods of measuring service quality and increasing customer loyalty. The research methodology used is qualitative, and data is collected through secondary sources. The findings highlight the importance of service quality in achieving customer loyalty and provide recommendations for McDonald's to enhance customer loyalty within one month.