| APO | A Perfect Opportunity 
| Others |
| APO | Abductor Pollicis Obliquus
| Others |
| APO | Absolutely Positioned Object
| Others |
| APO | Academic Personnel Office
| Others |
| APO | Accessory Power Outlets
| Others |
| APO | Accountable Property Officer
| Others |
| APO | Accredited Parking Organization
| Others |
| APO | Accurate, Professional, On-time
| Others |
| APO | Acting Pilot Officer
| Others |
| APO | Acute Pulmonary Oedema
| Others |
| APO | Ad Per Offer
| Others |
| APO | Adjusted Plan Options
| Others |
| APO | Administrative Protective Orders
| Others |
| APO | Adriamycin, Predisone, Oncovin
| Others |
| APO | Advanced Placement Option
| Others |
| APO | Advanced Planner and Optimizer
| Others |
| APO | Advanced Planner Optimizer
| Others |
| APO | Advanced Planning And Optimization
| Others |
| APO | Advanced Planning Optimizer
| Others |
| APO | Adverse Pregnancy Outcome
| Others |
| APO | Advising Programs Office
| Others |
| APO | Afloat Pre-positioning Operation
| Others |
| APO | African People's Organisation
| Others |
| APO | African Press Organization
| Others |
| APO | Agency Procurement Officer
| Others |
| APO | AIDS Project of the Ozarks
| Others |
| APO | Air Post Office
| Others |
| APO | Alcohol Procurement Officer
| Others |
| APO | All Power Options
| Others |
| APO | All-in-One Personal Organizer
| Others |
| APO | Alpha Phi Omega
| Others |
| APO | Amateur Philatelists Organization
| Others |
| APO | American Pops Orchestra
| Others |
| APO | Apache Peak Observatory
| Others |
| APO | Apache Point Observatory
| Others |
| APO | Apartado, Colombia
| Others |
| APO | Apochromat chromatic & spherical aberration reduction lens
| Others |
| APO | Apochromatic
| Others |
| APO | apolipoprotein
| Others |
| apo | apothem
| Others |
| APO | Application Pedagogique de l'Ordinateur
| Others |
| APO | Application Platform Optimization
| Others |
| APO | Apprentice Police Officer
| Others |
| APO | Approved Pre Owned
| Others |
| APO | ARDEC Project Officer
| Others |
| APO | Armenian Philharmonic Orchestra
| Others |
| APO | Army Post Office
| Others |
| APO | Army/Air Force Post Office
| Others |
| APO | ASAS (All-Source Analysis System) Project Office
| Others |
| APO | Ashampoo Photo Optimizer
| Others |
| APO | Ashbury Precision Ordnance
| Others |
| APO | Asian Productivity Organisation
| Others |
| APO | Asian Productivity Organization
| Others |
| APO | Assiste Par Ordinateur
| Others |
| APO | Atmospheric Potential Oxygen
| Others |
| APO | Auckland Philharmonia Orchestra
| Others |
| APO | Audio Processing Object
| Others |
| APO | Audio Processing Objects
| Others |
| APO | Authorized Personnel Only
| Others |
| APO | Automatic Parallelization Option
| Others |
| APO | Automatic Payment Order
| Others |
| APO | Automatic Power Off
| Others |
| APO | Automatic Purchase Order
| Others |
| APO | Automotive Products Operations
| Others |
| APO | Autonomous Period of Operation
| Others |
| APO | Autonomous Provider Organisation
| Others |
| APO | Auxiliary Police Officer
| Others |
| APO | Average Passenger Occupancy
| Others |
| APO | AWIPS Program Office
| Others |
| APO | Office of Aviation Policy and Plans
| Others |