Professionalism, one of the most important issues that modern societies attach great importance today. It is a concept that is generally believed, necessitates specialisation in the field, and that have been discussed by different occupational groups for many years. Nurses has neglected in defining and codifying professionalism in nursing indices, in the professional framework of nursing, and the provision of the necessary basis for the development of these indices was delayed in today's nursing. Today, professionalism has been considered as an important element in nursing. Nurse practitioners should aware of their own values, principles and assumptions, and can learn by their own experiences, in order to be able to guide in professionalism. It is very important to acquire professional values in order that professional identity can be formed in nursing, which is a practice-based profession. This book that is explain the professionalism in nursing, the professional values and professional behavior in detail is a guide of using for academicians, researchers and students keen on studying nursing.