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 This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.