This empirical research is based on the study of the relationship between the perception of the marketing mix and the quality of service and customer loyalty in a restaurant in the department of Lima - Peru. The field work was carried out in the Delpino restaurant located in the province of Huaral, district of Chancay. A total of 400 customers were surveyed. The results obtained can serve as a guide for businesses in the same field in terms of the variables studied.