Purpose: The main purpose of this study was to identify the essential meaning of clinical supervision for psychiatric mental health nurse practitioners. Methods: Data were collected in 2015 through individual in-depth interviews using open-ended questions from 9 women psychiatric mental health nurse practitioners. Each interview lasted about 90 minutes. Verbatim transcripts were analyzed using the Giorgi's phenomenological analysis method. Results: The results of the analysis showed the following four categories: 'Barren mental health site alone’, ‘Enduring with reflective supervision’, ‘Professional competence enhanced by continuous supervision’, ‘Maintaining a healthy life balance as a psychiatric mental health nurse practitioner’. Conclusion: The findings in this study provide helpful insights for understanding the need for clinical supervision in the psychiatric mental health nurse practitioner course. The results also provide support for the psychiatric mental health nurse practitioner course and practice development for psychiatric mental health nurses at the work site.