The study aimed to demonstrate the impact of the quality of electronic services in its dimensions (ease of use - efficiency - responsiveness - privacy - credibility) in Bank Muscat on customer loyalty. The researcher used the descriptive analytical approach, and the study population consisted of all Bank Muscat customers in the Sultanate of Oman, and a sample was chosen. A random sample of 166 Bank Muscat customers in the Sultanate of Oman. The researcher used the questionnaire as a tool to collect information, and it consisted of two measures: the first measure: quality of electronic services, the second measure: customer loyalty, and the study reached several results, the most important of which are: There is a statistically significant relationship at the significance level (0.01) between the quality of electronic services and its dimensions (ease of use - Efficiency - Responsiveness - Privacy - Credibility) in Bank Muscat on customer loyalty. The results also revealed that the arithmetic mean for all dimensions of the quality of electronic services ranges between (4.04-4.32), and the standard deviation ranges between (0.72-0.87), and they all came in at a high degree. Which indicates that the level of quality of electronic services in its dimensions (ease of use - efficiency - responsiveness - privacy - credibility) at Bank Muscat is high. The researcher presented some recommendations, the most important of which are: spreading awareness in banking institutions about the importance of electronic services and ways to improve them, and conducting training courses for employees in banking institutions; To improve how to deal with electronic services and raise their quality. key words : Quality of services, electronic services, customer loyalty.