Background: Psychiatric mental health nurses are the key members in different setting who
encounter unique situations that may bring about high levels of stress. So, building positive
psychological states among nurses with confidence to succeed at difficult tasks making a
positive attribution about succeeding now and in the future. Aim: the present study aimed to
determine nurses' psychological capital, subjective wellbeing and their relation with perceived
occupational stress. Design: A descriptive correlational research design was utilized in this
study. Setting: The study carried out at the Tanta Mental Health Hospital Subjects: A
convenient sample of 100 nurses who are directly worked with patient. Tools: three tools were
used to collect data of this study. Psychological Capital Questionnaire, the subjective
Wellbeing Scale and Expanded Nursing stress Scale. Result: The main results revealed that
there was a statistically significant negative correlation between psychological capital and
subjective wellbeing with expanded nursing stress. Moreover that, there was a statistically
significant positive correlation between nurses' level of subjective wellbeing and their level of
psychological capital. Conclusion: this study concluded that, psychological capital act as a
mediator that may have an impact on the association between nurses' psychological well-being
and occupational stress. Recommendations: based on the findings this study suggest that
psychiatric nurses' stress can be reduced by implementing various health care programs
designed to increase psychological capital and subjective wellbeing