This article reports a part of the findings from a project entitled 'Investigating psychological support services to build up a professional code of ethics for Vietnamese psychologists', coded VII.1-2013.10, which is funded by the National Foundation for Science and Technology Development (NAFOSTED) and directed by Prof. Dr. Tran Thi Minh Duc. By examining existing practice on (l) ways to maintain confidentiality and (2) the limits of confidentiality and collating this practice with requirements specified in some well-developed Codes of Ethics for Psychologists, the project's findings expose gaps in both psychotherapists' and psychology students' awareness on principles of confidentiality. It IS documented that about one third of psychologists do not recognize well enough the importance of confidentiality during their practice. In companson to psychological practitioners, students generally show better understanding and acknowledgement of confidentiality principles. Similarly, psychologists who have never charged for their services are better aware of confidentiality principles than those who have.