VAD is a TLA that can mean one of the following:

• Variable Air Duct is an automobile technology. An engine equipped with a VAD intake has a low-restriction secondary intake before the air filter that opens at high RPM to allow more air to enter. Mazda uses this technology on the Mazda6 engine.

• Ventricular Assist Device, a piece of medical machinery.

• Voluntary Aid Detachment, a nursing organisation operating in British Empire countries during World Wars I and II.

• Vincristine-Adriamycin-Dexamethasone, a Chemotherapy regimen used for multiple myeloma.

• Voice Activity Detection is used in speech encoding software to determine if the voice being encoded is human speech or background noise.

• Value Added Dealer

• Value Added Distributor

• Value Added Developer
• Volunteers Association of Defence