AD 3 is a year in the Gregorian calendar.
AD 3 or AD-3 may also refer to:
- Salmson AD.3, an aircraft piston engines of the 1920s
- Adaridi AD 3, a Finnish experimental aircraft of the 1920s
- AD-3, the third production variant of the Douglas AD Skyraider aircraft
- One of the experiments running on the Antiproton Decelerator
- USS Dobbin (AD-3), a US Navy destroyer tender
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