| PDF | Portable Document Format (Adobe Acrobat) | |
| PDF | Personal Data Form | |
| PDF | Personal Democracy Forum | |
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| PDF | Probability Density Function | |
| PDF | Parkinson's Disease Foundation | |
| PDF | Probability Distribution Function | |
| PDF | Post-Doctoral Fellowship | |
| PDF | Pair Distribution Function | |
| PDF | Portable Data Format (common but incorrect) | |
| PDF | Portable Data File (common but incorrect) | |
| PDF | Professional Development Fund (various organizations) | |
| PDF | Professional Development Foundation (UK) | |
| PDF | Periodic Density Functional (theory) | |
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| PDF | Planet Dog Foundation (Westbrook, ME) | |
| PDF | Pretrial Detention Facility (various locations) | |
| PDF | Positive Displacement Flowmeter | |
| PDF | Path Delay Fault (electronics) | |
| PDF | Percival David Foundation (London, UK) | |
| PDF | Printer Description File (File Name Extension) | |
| PDF | Parallel Depth First (computing) | |
| PDF | Powder Diffraction File | |
| PDF | Package Definition File (Microsoft Systems Management Server) | |
| PDF | Pretty Damn Funny | |
| PDF | Peritoneal Dialysis Fluid | |
| PDF | Pseudo Derivative Feedback | |
| PDF | People's Defence Forces | |
| PDF | Pretty Darn Fast | |
| PDF | Pakistan Development Forum (international consortium) | |
| PDF | Pop Directional Formatting (unicode) | |
| PDF | Power Delay Profile | |
| PDF | Policy Decision Function | |
| PDF | Pooled Development Fund | |
| PDF | Panamanian Defense Force | |
| PDF | Playa del Fuego (art festival) | |
| PDF | Permanent Defence Force (Irish Army) | |
| PDF | Please Don't Fart | |
| PDF | Positive Definite Function (mathematics) | |
| PDF | Printer Definition File | |
| PDF | Program Development Facility | |
| PDF | Polypeptide Deformylase | |
| PDF | Popular Defense Force | |
| PDF | Postscript Document Format (common but incorrect) | |
| PDF | Peoples' Democratic Front (Communist Party of India) | |
| PDF | Point Detonating Fuze | |
| PDF | Program Data File | |
| PDF | Personnel Deployment Function | |
| PDF | Power Distribution Frame | |
| PDF | Precision Direction Finding | |
| PDF | Paid Dues Festival (est. 2006) | |
| PDF | Processor Defined Function | |
| PDF | Pair Density Function | |
| PDF | Particle Distribution Function (physics) | |
| PDF | Proficiency Diploma in French (Nigeria) | |
| PDF | Petri Net Definition File (mathematical modeling) | |
| PDF | Planar Deformation Feature (geoscience) | |
| PDF | Pe Do File | |
| PDF | Programmable Data Format | |
| PDF | Parton Distribution Function | |
| PDF | Power Down Flag | |
| PDF | Program Data Form | |
| PDF | Planetary Defence Force (Warhammer 40,000) | |
| PDF | People's Development Foundation (India) | |
| PDF | Principal Direction of Fire | |
| PDF | Panguna Development Foundation (Papua New Guinea) | |
| PDF | Precision Direction Finder | |
| PDF | Postal Distribution Facility | |
| PDF | Path Diversity with Forward Error Correction | |
| PDF | I Profumi Di Firenze (Italian perfume) | |
| PDF | Pearl Drummers Forum (website) | |
| PDF | Pretty Damn Funky | |
| PDF | Premier Diesel Fuel (low sulfur diesel) | |
| PDF | Primary Direction of Fire | |
| PDF | Pittsburgh Dialogue Foundation | |
| PDF | Pulse Density Function | |
| PDF | Plant Design Factor | |
| PDF | Payload Data Formatter | |
| PDF | Paradox Data File | |
| PDF | Procurement Data File | |
| PDF | Publico Decreto Fecerunt (Latin: Made by Public Decree, epigraphy) | |
| PDF | Product Development & Fulfillment company | |
| PDF | Paranormal Dampening Field (remote viewing) | |
| PDF | Pepito Domination Force | |