This research aimed to study the effect digital marketing on customer loyalty by applied on the Egyptian telecom companies (Qalyubia Governorate). Model proposed for the study shows the dimensions of digital marketing and customer loyalty. In order to collect primary data, a questionnaire has been designed and satisfied sample has been collected from customers and employees of the four Egyptian telecom companies (Vodafone, Orange Etisalat, WE) in their main branches in Qalyubia Governorate, and the sample size was (632) and the response was (621) percentage (99%) of the total sample size. The findings shows that there is positive effect of digital marketing on customer loyalty. There are significant differences between the respondents' opinions about digital marketing and customer loyalty according to demographic variables.And The results also showed that there are differences between the opinions of the respondents, including employees and customers, about digital marketing and customer loyalty.