AD 3 (disambiguation)
# AD 3 (disambiguation)

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
