Background: later, until the end of 20^th century, customer satisfaction and loyalty were just a slogan. Nowadays, there are a lot of efforts for improving the tools for quality management and extending the customer orientation culture by researchers, experts and managers of organizations. This issue improves that loyalty is the most important criteria for determining the organizations’ success and increasing the benefit which can be obtained by ethics and professional behavior.
Methods: this research, according to its goal, is an apply research, and as data collection point of view (for validating the hypothesis and questions) is descriptive and is from regression branch. The data used are collected form 150 customers of branches of Bank XYZ in Tehran and the presented model has been tested by t-test examine.
Results: statistical analysis shows ethics and professional behavior affects the loyalty of customers and there is a significant relationship between them.
Conclusion: this research shows loyalty can be shaped from ethics and professional behavior. Between the recognized factors, confidentially has the most relationship with loyalty.