| NAA | National Airport Authority |
| NABARD | National Bank for Agriculture and Rural Development |
| NADA | National Anti-Doping Agency |
| NASA | National Aeronautics and Space Administration |
| NEERI | National Environment Engineering Research Institute |
| NATA | Natural Aptitude Test for Architecture |
| NCEP | National Committee on Environmental Planning |
| NCERT | National Council of Educational Research and Training |
| NeGP | National e-governance Plan |
| NEP | National Education Policy |
| NEPA | National Environment Protection Authority |
| NHDP | National Highways Development Project |
| NHRC | National Human Right Commission |
| NITI | Aayog National Institution for Transforming India |
| OCI | Overseas Citizenship of India |
| OAS | Organisation of American States |
| OAU | Organisation of African Unity |
| ODS | Ozone Depletion Substances |
| OIC | Organisation of Islamic Countries |
| OPEC | Organisation of the Petroleum Exporting Countries |
| OSCE | Organisation for Security and Cooperation in Europe |
| PURA | Providing Urban Amenities in Rural Areas |
| PATA | Pacific Asia Travel Association |
| POTA | Prevention of Terrorism Act |
| PSLV | Polar Satellite Launch Vehicle |