APD

APD is an initialism that may refer to:

Medicine

 * Afferent pupillary defect
 * Acid Peptic Diseases
 * Ambulatory Peritoneal Dialysis
 * Pamidronic acid, also known as aminohydroxypropylidene bisphosphonate
 * Antipsychotic Drugs
 * Auditory processing disorder, difficulty in recognising sounds
 * Antisocial personality disorder
 * Avoidant personality disorder
 * Antimicrobial Peptide Database
 * Autoimmune progesterone dermatitis

Law enforcement

 * Airport Police Division, Singapore
 * Akron Police Department
 * Albany Police Department (Oregon)
 * Albuquerque Police Department
 * Amtrak Police Department
 * Anaheim Police Department
 * Anchorage Police Department
 * Annapolis Police Department
 * Antioch Police Department
 * Apopka Police Department
 * Arcadia Police Department
 * Asheville Police Department
 * Atlanta Police Department
 * Aurora Police Department, Colorado
 * Austin Police Department

Other

 * Air Passenger Duty, an excise duty levied on passengers flying from UK airports
 * APD, NYSE stock symbol for Air Products & Chemicals
 * APD, reporting mark for the Albany Port Railroad
 * Alianza por la Democracia, a Dominican Republic political party
 * Alpha Phi Delta, an American college fraternity
 * APD, National Rail code for Appledore (Kent) railway station
 * APD-40, a stretch of highway near Cleveland, Tennessee
 * A designation for highways that are part of the Appalachian Development Highway System (ADHS).
 * Association de la paix par le droit, a French pacifist organisation
 * Avalanche photodiode, a device for counting photons
 * Apple Accessory Products Division, former name for The Keyboard Company, Inc.
 * A retired US Navy hull classification symbol: High-speed transport (APD)
 * American political development