AP3

AP3 or AP-3 may refer to:


 * The ABC Model of Flower Development
 * Andrew Pendelton III, an American professional wrestler
 * USS Hancock (AP-3), a transport ship acquired by the United States Navy in 1902 which saw service during World War I
 * AP-3C Orion, a variant of the P-3C Orion maritime patrol aircraft used by the Royal Australian Air Force