The research problem posed for this thesis: What is the relationship between the quality of service and customer satisfaction in the Los Portales supermarket in the city of Iquitos 2020? At the same time, its objective sought to determine the relationship between the quality of service and customer satisfaction in the Los Portales supermarket in the city of Iquitos 2020; In addition, the specific objectives are to determine the relationship between tangibility, security, reliability, empathy, responsiveness, with customer satisfaction in this study. The methodology used is the quantitative type study; In addition, the questionnaire was used as an instrument for data collection, using the survey as a technique. After processing the data, the following result was obtained: Through the normality test using the Kolmogorov-Smirnov statistic (50 cases or more), a significance of 0.000 is obser...