| OAD | One and Done | |
| OAD | Once-A-Day (milking) | |
| OAD | Oxford American Dictionary | |
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| OAD | Original Animation DVD | |
| OAD | Occipitoatlantal Dislocation (medical) | |
| OAD | Orlando Anime Day (Florida) | |
| OAD | Opinionated about Dining | |
| OAD | Old as Dirt (band) | |
| OAD | Over Air Download (firmware update method) | |
| OAD | Oklahoma Association of the Deaf | |
| OAD | Operationally Available Data | |
| OAD | Open Access Directory | |
| OAD | Office for Addictive Disorders (Louisiana) | |
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| OAD | Over-Action Dolphin (dance move) | |
| OAD | Ordinary Arbitration Division (ICAS) | |
| OAD | Open Abdominal Drainage | |
| OAD | Oss Alarm Dispatcher (Alcatel-Lucent; Paris, France) | |
| OAD | Operational Availability Date | |
| OAD | Ordo Augustiniensium Discalceatorum (Latin: Order of Discalced Augustinians) | |
| OAD | Oral Anti-Diabetic | |
| OAD | Other Adverse Disposition (criminal cases) | |
| OAD | Off-Axis Directivity | |
| OAD | Oregon Association of the Deaf, Inc. | |
| OAD | Obstructive Airway Disease | |
| OAD | Office of Atomic Development | |
| OAD | Overall Diameter (ophthalmic) | |
| OAD | Original Air Date | |
| OAD | Operational Availability Demonstration | |
| OAD | Ontario Association of the Deaf (Canada) | |
| OAD | Object Activation Daemon | |
| OAD | Obscure Auditory Dysfunction | |
| OAD | Officers' Accounts Division (US Navy) | |
| OAD | Occupation Analysis Document | |
| OAD | Ohio Association of the Deaf | |
| OAD | Option Adjusted Duration | |
| OAD | Overseas Arrivals and Departures | |
| OAD | Ordered to Active Duty | |
| OAD | Ordered Algebraic Decoding | |
| OAD | Overactive Adrenaline Disorder (Ford Motors marketing campaign) | |
| OAD | Operational Aviation Detachment | |
| OAD | Special Audits Division (DCAA) | |
| OAD | Organisation d'Aide au Developpement (French: Organization to Aid Development) | |