The main objective of this study is to clarify the concept of Lean Management by describing the system and the key concepts and techniques that underline its implementation. The study shows what organizations, in particular commercial banks, can gain from Lean Management. To achieve this objective, it has been conceived a comparative study of Lean Management using available literature, critical analysis and professional experience of the author. The implementation of a Lean Management program in a bank will result in a Lean Organization (less waste, less bureaucracy, but more employee knowledge and empowerment, more productivity, more satisfied customers). As practical implications, the study shows how to address change, how to implement Lean in different parts of business. The originality and value of the study comes from the suggestions that are made regarding concepts and methods that would contribute a Lean Organization through an integrated program.