Occupational health psychology (OHP) encompasses important topics such as workplace well-being, stress management, and safety. OHP is its own area of psychology, with journals and societies (Society for Occupational Health Psychology; https://sohp-online.org">https://sohp-online.org/) devoted to it within the US and around the world. It is also related to many areas of psychology (e.g., clinical) as well as to I-O psychology given its focus on individuals at work. This chapter addresses what occupational health psychology is; the stress and strain process; ways to avoid and manage stress; features of workplace wellness; features of safety at work; key legal and global issues surrounding occupational health psychology; and the current issues and research in occupational health psychology.