Service quality is defined as the degree of alignment between customers' expectations and theirrnperceptions of the service received. Measuring of customers' satisfaction is also recess GlY to thernprocess of serving customers. The purpose of this study is to assess whether the CommercialrnBank of Ethiopia, North Addis Ababa District branch Banks customers were satisfied with thernservice they were provided by the banks and to identifY the areas in which the bank has seriousrndrawbacks. To conduct this research, descriptive survey method was used. The questionnairernwas designedji-om the SERVQUAL model which was developed by Parasuraman (1988). Fromrnthe Jourteen branches of Commercial Bank of Ethiopia North Addis Ababa District Branches,rnfour branches were selected purposely. To these selected branches, 300 questionnaires (75rnquestionnaires to each branch) were distributed. As a result the SERVQUAL scores for thefivernservice quality dimensions and the 22 attributes of service quality dimensions were foundrnnegative. The customers of the banks were dissatisfied by the service quality of the bank providedrnto them. The customers were also ranked first reliability as the most important andrnresponsiveness as the second important attribute of service quality dimension. To close the gaprnbetween cllstomers' expectation and perception, the bank managers are suggested to providerntraining to staff personnel who contact customers in the area of service quality dimensionsrne:,pecially reliability, assurance, responsiveness, empathy and tangibility. In relation torncustomers ' satisfaction, bank managers suggested to evaluate the service they provide to theirrncustomers from time to time. In addition to this, they are also recommended to facilitate waysrnreceiving feedback and encouraging customers to provide them Jeedback. Finally, bankrnmanagers are also recommended to undertake investigation with regard to the most importantrnservice q1lality attribute to customers and based on the research result, they are suggested tornmobilize financial, material and human resources towards the most relatively important attributernservice quality.