Anxiety is more common in psychiatric mental health nurses because they frequently work long hours and endure significant levels of stress. This study sought to know how a progressive muscle relaxation and breathing techniques training program affected the anxiety levels of Saudi psychiatric mental health nurses. Design: The current study used a quasi-experimental research design. Sample: Based on the inclusion and exclusion criteria, a purposive sample of 80 psychiatric nurses was chosen. For the intervention group, forty nurses were chosen at random. Tools: personal data sheets and the Anxiety State and Traits Inventory were used to gather data for the current investigation. The results showed that anxiety levels before and after a relaxation training program differed statistically significantly. Recommendation: Designing and implementing programs must be carried out for prevention and management of stress and anxiety among psychiatric nurses are necessary.