• Scuba diving, the use of a self-contained breathing set to stay underwater for periods of time
• Scuba set, the equipment used to do scuba diving
• Scuba (Transformers) - a fictional character in the Transformers fictional universe

SCUBA may also refer to: Self Contained Underwater Breathing Apparatus

• Submillimetre Common-User Bolometer Array, an instrument used on the James Clerk Maxwell Telescope