APD is an initialism that may refer to:
Medicine[edit]
- 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[edit]
- 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[edit]
- 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