An occupational hazard is a risk of injury, illness or other harm that arises from the nature of a worker’s job or working environment, rather than from random or unrelated causes. In legal practice, the term is used in health and safety, employment, personal injury and industrial disease claims to describe foreseeable work-related risks that an employer must identify, assess and, so far as reasonably practicable, control.“Occupational hazard” is a descriptive expression rather than a defined statutory term, but it underpins employers’ common law and statutory duties across the UK and Ireland, including duties to provide a safe system of work, safe plant and equipment, and adequate training and supervision. It is central to concepts such as “foreseeability”, “reasonably practicable” precautions and vicarious liability.Typical examples include exposure to hazardous substances, repetitive strain, noise, manual handling, workplace violence and psychosocial risks such as stress. Usage is broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland, although precise obligations and terminology derive from differing health and safety and employment legislation and case law in each jurisdiction.