| Acronym | Definition |
|---|
| PIE | Partners in Education |
| PIE | Proto-Indo European (linguistics) |
| PIE | Portfolio Investment Entity |
| PIE | Pan Island Expressway (Singapore) |
| PIE | Pielaveden (Finnish) |
| PIE | Prison Industry Enhancement (programs) |
| PIE | Pulmonary Interstitial Emphysema (medical) |
| PIE | Post-Irradiation Examination |
| PIE | Partners in Excellence (customer-satisfaction program instituted by ARI leasing/fleet management company) |
| PIE | Persistent Identification Element |
| PIE | Public Issues Education |
| PIE | Personal Information Environment |
| PIE | Pacific Intercultural Exchange (San Diego, CA) |
| PIE | Process Improvement Experiment |
| PIE | Period of Initial Eligibility (insurance) |
| PIE | Price in Effect |
| PIE | Pacific Intermountain Express |
| PIE | Pulsed Irrigation Evacuation (enema) |
| PIE | Polymorphism, Inheritance, Encapsulation |
| PIE | Postulated Initiating Event |
| PIE | Peer Integration Exchange |
| PIE | Package Installation Envelopes (Cisco) |
| PIE | Particle Impact Experiment |
| PIE | Pride in Excellence |
| PIE | Protocol Information Element |
| PIE | Private Internet Exchange |
| PIE | Permanent Intermittent Employee |
| PIE | Federación de la Plataforma de los Independientes de España |
| PIE | Parking Industry Exhibition and Conference |
| PIE | Psychological Impacts and Effects |
| PIE | Propagation, Infection, Execution (computer security) |
| PIE | Personal Incidental Expenditure |
| PIE | Productivity Integrated Environment |
| PIE | Problems, Issues & Expectations (Analysis) |
| PIE | Policy and Information Encyclopedia |
| PIE | Pulse Interference Elimination |
| PIE | Partitioned/Programmable Interface Equipment |
| PIE | Policy Issuance Entry (Queue - Insurance) |
| PIE | St Petersburg/Clearwater, FL, USA - St Petersburg/Clearwater International (Airport Code) |
| PIE | Parlamento Indio Estatal (Spanish: Indian State Parliament; Mexico) |