Psychiatric nurses employed in secure wards experience heightened stress and depression linked to significant patient hostility, violence, instability, and dangers to their own or others' safety. Consequently, this research aimed to examine sought to investigate how training in problem-solving techniques affected on depression levels among psychiatric mental health nurses in Saudi Arabia. Design: A quasi experimental research design. Sample: A purposive sample of eighty psychiatric nurses. Forty nurses were selected randomly in the intervention group. Tools: personal data sheet, and Beck Depression Inventory. Results: a statistically significance difference was found between depression at pre and post problem solving training among nurses. Conclusion: This research presented substantial evidence demonstrating that problem solving skills training successfully lowers depression in psychiatric nurses. It is highly recommended to implement psycho-educational programs aimed at raising awareness of depression and psychological issues in the workplace for psychiatric nurses.