This study compared the stress, anxiety and depression levels in employees working in the health, education and security sectors. The study also investigated the effect of psychological resilience on stress, anxiety, and depression levels and whether the stress, anxiety, depression and psychological resilience levels of employees differ according to occupational and demographic variables. In this cross‐sectional study, 1222 employees participated, comprising 50.8% from the health sector, 37.7% from education, and 11.5% from security. Data were collected using the Stress, Anxiety, and Depression Scale‐21 and the Brief Resilience Scale. The study revealed varying rates of severe stress (49.1%), anxiety (74.0%), and depression (53.2%) among participants. Health employees experienced higher stress (52.1%), anxiety (77.0%), and depression (58%) rates compared to those in education (46.4%, 72.4%, and 48.4%) and security sectors (44.3%, 66.4%, and 48.5%). Health employees exhibited higher stress, anxiety, and depression levels, signifying a significant difference. Furthermore, the research identified psychological resilience as a crucial predictor of stress, anxiety, and depression. Additionally, these mental health issues were more prevalent among younger individuals with less work experience, females, private sector employees, singles, and those without children. The findings of the study showed that the level of stress, anxiety and depression was high in employees working in all three sectors (health, education and security), but mental problems were more common in health employees. The fact that psychological resilience is a significant predictor of stress, anxiety and depression levels indicates that this factor should be taken into account.