| PAI | Palo Alto Innovation 
| Others |
| PAI | Parrish Associates, Inc.
| Others |
| PAI | Parts Associates Inc
| Others |
| PAI | Passione Auto Italiano
| Others |
| PAI | Payment Alliance International
| Others |
| PAI | Pentasia and All In
| Others |
| PAI | People Are Idiots
| Others |
| PAI | Performance Air Intake
| Others |
| PAI | Performing Arts Institute
| Others |
| PAI | Personal Accident Insurance
| Others |
| PAI | Personal Accidental Insurance
| Others |
| PAI | Personal Activity Intelligence
| Others |
| PAI | Personal Artificial Intelligence
| Others |
| PAI | Personality Assessment Inventory
| Others |
| PAI | Pesticide Active Ingredient
| Others |
| PAI | Peugeot Automobili Italia
| Others |
| PAI | Phoenix Alternatives Inc
| Others |
| PAI | Photographers, Artists, and Illustrators
| Others |
| PAI | Physicians Advocacy Institute
| Others |
| PAI | Piedmont Associated Industries
| Others |
| PAI | Pilipinas Autogroup Inc.
| Others |
| PAI | Pioneer Automotive Industries
| Others |
| PAI | Plan Administrators Inc
| Others |
| PAI | Planned Administrators Inc
| Others |
| PAI | Plans, Analysis, and Integration directorate
| Others |
| PAI | Plant Area Index
| Others |
| PAI | Plasminogen Activator Inhibitor
| Others |
| PAI | Platform of Artificial Intelligence
| Others |
| PAI | Policy Analysis Inc
| Others |
| PAI | Polyamide-Imide
| Others |
| PAI | Pompe A Injection
| Others |
| PAI | Population Action International
| Others |
| PAI | Post Acquisition Integration
| Others |
| PAI | Practice Advancement Initiative
| Others |
| PAI | Pre-Approval Inspection
| Others |
| PAI | Premise Attachment Interface
| Others |
| PAI | Price Alignment Interest
| Others |
| PAI | Primary Aircraft Inventory
| Others |
| PAI | Process After Input
| Others |
| PAI | Professorial Advancement Initiative
| Others |
| PAI | Progressive Alcohol Injection
| Others |
| PAI | Project Administration Instruction
| Others |
| PAI | Project And Interact
| Others |
| PAI | Projection And Interaction
| Others |
| PAI | Propaganda And Information
| Others |
| PAI | Protection & Advocacy, Inc.
| Others |
| PAI | Public Access Initiative
| Others |
| PAI | Public Affairs Internal
| Others |
| PAI | Pulse Accumulator Input
| Others |
| PAI | Pulse Air Injection
| Others |