The study primary goal is to evaluate how well public sector banks serve their customers in the Tirunelveli District. The survey has been carried out among the account holders of the public sector banks using a well structured questionnaire to assess the five service quality aspects. The structured SERVQUAL questionnaire was used to choose thirty two statements which were then changed to make them exact and most appropriate for evaluating the quality of services provided by the public sector banks. In order to conduct the survey 150 customers were chosen using a stratified random sample method. The results shows that there is a discrepancy between the expected and perceived level of service quality of the public sector banks. The study findings reveals that public sector banks have been working hard to improve the efficiency and existence of their business operations despite rising competition on one front and a loss of market share on the other.