Occupational safety and health or occupational health and safety is a multidisciplinary field concerned with the safety, health, and welfare of people at work. OSH is related to the fields of occupational medicine and occupational hygiene and aligns with workplace health promotion initiatives.

OSH also protects all the general public who may be affected by the occupational environment.

In common-law jurisdictions, employers have the common law duty (also called duty of care) to take reasonable care of the safety of their employees. Statute law may, in addition, impose other general duties, introduce specific duties, and create government bodies with powers to regulate occupational safety issues.
Details of this vary from jurisdiction to jurisdiction.

Prevention of workplace incidents and occupational diseases is addressed through the implementation of occupational safety and health programs at company level