Commercial diving is a branch of professional diving carried out by commercial organizations for purposes such as:

• Civil engineering in harbours, water supply and drainage systems
• Contructing, testing and maintaining equipment for the crude oil and offshore construction industries
• Boat and ship inspection, cleaning and maintenance
• Fish farm maintenance
• Fishing, such as harvesting higher value animals like molluscs and crustaceans
• Underwater salvage, for example in sunken ships and aircraft.

See also Diving activities