| OBC |
Other Backward Classes |
| OCR |
Optical Character Recognition |
| OECD |
Organisation for Economic Cooperation and Development |
| OGL |
Open General License |
| OIL |
Oil India Limited |
| OK |
All Correct |
| ONGC |
Oil and Natural Gas Corporation |
| OOP |
Object Oriented Programme |
| OPEC |
Organisation of Petroleum Exporting Countries |
| OSCAR |
Orbiting Satellite Carrying Amateur Radio |
| OTR |
 Operational Turn Around |
| PAN |
Permanent Account Number |
| PCI |
Press Council of India |
| PCS |
Provincial Civil Services |
| PERDA |
Pension Fund Regulatory and Development Authority |
| Ph. D |
Doctor of Philosophy |
| Ph.D. |
Doctor of Philosophy (Philosophiae Doctor) |
| PIL |
Public Interest Litigation |
| PIN |
Postal Index Number |
| PLO |
Palestine Liberation Organisation |
| PM |
Post Meridian/Prime Minister |
| POTA |
Prevention of Terrorism Act |
| PRO |
Public Relations Officer |
| PSLV |
Polar Satellite Launch Vehicle |
| PTI |
Press Trust of India |
| PTO |
Please Turn Over |
| PVC |
Poly Vinyl Chloride/Paramvir Chakra |
| PVSM |
Param Vishisht Seva Medal |
| PWD |
Public Works Department; |
| PWG |
People's War Group |
