AP9

AP9, AP-9, AP.9, AP 9, or variant may refer to:
 * Autopista AP-9, an expressway in Galicia, Spain
 * Seversky AP-9, USAAC fighter
 * USS Zeilin (AP-9), US Navy World War II Harris-class attack transport
 * AA Arms AP-9 semi-automatic 9mm pistol
 * FEG AP9 semi-automatic 9mm pistol
 * (47091) 1999 AP9, AP9 asteroid discovered in 1999, the 47091st asteroid ever discovered
 * AP.9 (rap artist) aka Bishop Shakur (born 1974), American rap artist