In recent years, various industries become increasingly aware of the importance of mental health. Mental health is closely related to the management of psychosocial hazards in the workplace. The oil and gas industry is considered to be one of the laggards in the management of workers' psychosocial hazards and mental health even though mental health is considered to affect workers' health and operational safety. Workplace bullying is a phenomenon that can give adverse effects to individual workers and the organization. For workers, bullying can interfere with physical health, psychological stress, and satisfaction with life and work. This paper discusses prevalence of workplace bullying, psychological stress, and satisfaction with life of workers in the upstream oil and gas industry. The phenomenon experienced by workers on Sites is compared with the experience of the office workers in this paper, with no significant differences found between the incidence of bullying and satisfaction with life between the two populations. On the other hand, there is a significant difference in the psychological stress and chronic diseases reported by the respondents. Site workers experience higher psychological stress and more reported chronic health disorders than the office workers.