| P&O | Peninsular and Oriental Steam Navigation Company 
| Others |
| P&O | Positioning & Orientation
| Others |
| p.o. | by mouth
| Others |
| P.O. | by mouth (per os) [Lat.]
| Others |
| p.o. | per os - by mouth or orally
| Others |
| P/O | Part Of
| Others |
| p/o | postoperative
| Others |
| Po | Chamber Pot (from the French - pot de chambre)
| Others |
| PO | Pacific Ocean
| Others |
| PO | Page Object
| Others |
| PO | Pages Out
| Others |
| PO | Paint Operation
| Others |
| PO | Painting Operations
| Others |
| PO | Pamatnik Odboje
| Others |
| PO | Pants Optional
| Others |
| PO | Parameters For Optimization
| Others |
| PO | Parental Overlords
| Others |
| PO | Parents Of
| Others |
| PO | Pareto Optimal
| Others |
| PO | Parity Outer
| Others |
| PO | Parole Officer
| Others |
| PO | Partial Open
| Others |
| PO | Partially Or
| Others |
| PO | Particular Orifice
| Others |
| PO | Partition Organized
| Others |
| PO | Partner Organization
| Others |
| PO | Passenger Operation
| Others |
| PO | Passport Office
| Others |
| PO | Pastor Oconnor
| Others |
| PO | Patent Overflow
| Others |
| PO | Path Order
| Others |
| PO | Path Ordered
| Others |
| PO | Patient Opinion
| Others |
| PO | Pay Off
| Others |
| PO | Peace Officer
| Others |
| PO | Peace Operations
| Others |
| PO | Pee-Ons
| Others |
| PO | Pensions and Other
| Others |
| PO | People's Organization
| Others |
| PO | Peoples' Organization
| Others |
| PO | Per Oral
| Others |
| PO | Per Os
| Others |
| PO | Per Os (by mouth)
| Others |
| PO | Per Os (By Mouth, or Orally)
| Others |
| PO | Per Os (Latin: by mouth, orally)
| Others |
| PO | Performance Objective
| Others |
| PO | Periodic Orbit
| Others |
| PO | Persistent Offender
| Others |
| PO | Personal Offer
| Others |
| PO | Personnel Office
| Others |
| Po | Petaoctet
| Others |
| PO | Petites Ondes
| Others |
| PO | Petrol Ofisi
| Others |
| PO | Petty Officer
| Others |
| PO | Physicians Orders
| Others |
| PO | Pick Off
| Others |
| PO | Piconics
| Others |
| PO | Pig Out
| Others |
| PO | Pilot Officer
| Others |
| PO | Piss Off
| Others |
| PO | Pissed Off
| Others |
| PO | Pisspoorportland Oregon
| Others |
| PO | Placeable Object
| Others |
| PO | Planning Objective
| Others |
| PO | Platforma Obywatelska
| Others |
| PO | Plus One
| Others |
| PO | Poker Oddity
| Others |
| PO | Polar Air Cargo
| Others |
| PO | Pole On
| Others |
| PO | Police Officer
| Others |
| PO | Police Officers
| Others |
| PO | Police Opeator
| Others |
| PO | police Originated
| Others |
| PO | Political Outlines
| Others |
| PO | Polonium
| Element |
| PO | Polynomial Order
| Others |
| PO | Polyolefin
| Others |
| PO | Polyteknikkojen Orkesteri
| Others |
| PO | Pooped Out
| Others |
| PO | Poorman Oregon
| Others |
| PO | Port Out
| Others |
| PO | Portable Obejects
| Others |
| PO | Portable Object
| Others |
| PO | Portland, Oregon
| Others |
| PO | PortugalOriflame
| Others |
| PO | Post and Office
| Others |
| PO | Post Office
| Others |
| PO | Post Operative
| Others |
| PO | Post-Orbit
| Others |
| PO | Postal Order
| Others |
| PO | Posting Online
| Others |
| PO | Power Outage
| Others |
| PO | Power Output
| Others |
| PO | Powerful Organization
| Others |
| PO | Prato (Provence)
| Others |
| PO | Preliminary Online
| Others |
| PO | Prelims Online
| Others |
| PO | Presenting Officer
| Others |
| PO | Presidents Office
| Others |
| PO | Pressure Overload
| Others |
| PO | Previous Owner
| Others |
| PO | Primary Object
| Others |
| PO | Primary Output
| Others |
| PO | Primary Outputs
| Others |
| PO | Principal Only
| Others |
| PO | Print Object
| Others |
| PO | Printer Operator
| Others |
| PO | Printer Operators
| Others |
| PO | PrintOut
| Others |
| PO | Privacy Officer
| Others |
| PO | Private Offer
| Others |
| PO | Probation Officer
| Others |
| PO | Probationary Officer
| Others |
| PO | Process Orchestration
| Others |
| PO | Process Order
| Others |
| PO | Proclaimed Offender
| Others |
| PO | Prodigal Outcasts
| Others |
| PO | Prodos Order
| Others |
| PO | Product Owner
| Others |
| PO | Production Order
| Others |
| PO | Proforma Order
| Others |
| PO | Program Objective
| Others |
| PO | Program Outcomes
| Others |
| PO | Program Owner
| Others |
| PO | Project Objectives
| Others |
| PO | Project Office
| Others |
| PO | Project Originals
| Others |
| PO | Projection Of ....
| Others |
| PO | Promotion Opportunity
| Others |
| PO | Prosody Only
| Others |
| PO | Protable Object
| Others |
| PO | Provocative Operation
| Others |
| PO | Provocative Operations
| Others |
| PO | Public Opinion
| Others |
| PO | Pular Theories
| Others |
| PO | Pull Off
| Others |
| PO | Pull Out
| Others |
| PO | Pump Operator
| Others |
| PO | Purchase Order
| Others |
| PO | Purchase Orders
| Others |
| PO | Purchasing Order
| Others |
| PO | Purge Output
| Others |
| PO | Purple Onion
| Others |
| PO | Put Outs
| Others |
| PO | PutOut
| Others |
| PO | Pyrenees Orientales
| Others |
| Po | Pyrrhotite
| Others |
| PO | The Price Of Other
| Others |