AD-5

AD-5 or variation, may refer to:


 * AD 5, the 5th year of the Common Era
 * USS Prairie, an auxiliary cruiser of the U.S. Navy
 * Douglas AD-5 Skyraider, fighter-bomber airplane
 * AD5 experiment "ALPHA" at the CERN Antiproton Decelerator ring; an antimatter physics experiment
 * Ad5, adenovirus serotype 5, a virus commonly used as a recombinant virus therapy vector (rAd5)
 * Alzheimer's disease, stage 5
 * Alzheimer's Disease 5, a familial variant of Alzhemier's; see List of OMIM disorder codes