This book is aimed at assessing the impact of regulatory and supervisory functions of National Bank of Ethiopia on the activities of Ethiopian private banking industry. The study examined the role played by the regulatory authorities towards a healthy supervision of the operation of banks in Ethiopia and also examined the tools, scope, methods and policy framework of supervision. For the study, mixed approach were adopted and the researcher incorporated self administered closed ended questionnaire for the quantitative aspect of the study and face-to-face interview for the qualitative aspect of the study. Descriptive statistics are used to compare the survey result and to analyze both results i.e. survey and interview with concurrent mixed method research approach were employed.