| 3G | Third Generation |
| AAA | Asian Athletics Association |
| AAFI | The Amateur Athletics Federation of India |
| AAPSO | Afro-Asian People's Solidarity Organization |
| AASU | All Assam Students Union |
| ABM | Anti Ballistic Missile |
| AC | Ante Christum (Before Christ), Ashok Chakra, Air Conditioner |
| ACC | Anxillary Cadet Core |
| AD | Ano Domini (After the birth of Jesus) |
| ADB | Asian Development Bank |
| AERE | Atomic Energy Research Establishment |
| AFI | Athletics Federation of India |
| AFMC | Armed Forces Medical College |
| AGOC | Asian Games Organization Committee |
| AI | Artifical Intelligence, Air India |
| AICC | All India Congress Committee |
| AICTE | All India Council for Technical Education |
| AIDS | Acquired Immuno Deficiency Syndrome |
| AIFF | All India Football Federation |
| AIIMS | All India Institute of Medical Science |
| AIL | Aeronautics India Limited |
| AIMPLB | All India Muslim Personal Law Board |
| AIR | All India Radio (Broadcasting) |
| AITUC | All India Trade Union Congress |
| AlFF | All India Football Federation |
| ALGOL | Algebric Oriented Language |
| AM | Ante Meridiem (before Noon), Amplitude Modulation |
| ANC | African National Congress |
| APEC | Asia Pacific Economic Cooperation |
| APECF | Asia Pacific Exchange and Cooperation Foundation |
| APSC | Army Postal Services Core |
| ARPANET | Advanced Research Project Agency Network |
| ASCII | American Standard Code for Information Interchange |
| ASEAN | Association of South East Asian Nations |
| ASI | Archaeological Survey of India |
| ASLV | Augmented Satellite Launch Vehicle |
| ASSOCHAM | Associated Chamber of Commerce and Industry (India) |
| ASWAC | Airborne Surveillance Warning and Control |
| AT&T | American Telegraphic and Telephone Co. Ltd. |
| ATC | Air Traffic Control |
| ATM | Automated Teller Machine |
| ATS | Anti Tetanus Serum |
| AVSM | Ati Vishisht Seva Medal |
| B Pharma | Bachelor of Pharmacy |
| B2B | Busines to Business |
| B2C | Business to Consumer |
| BAMS | Bachelor of Ayurvedic Medicine and Surgery |
| BARC | Bhabha Atomic Research Centre |
| BBC | British Broadcasting Corporation |
| BBS | Bulletin Board Service |
| BC | Before Christ |
| BCCI | Board of Control for Cricket in India |
| BCG | Bacillus Chalmette Guerin (Anti TB Vaccine) |
| BEA | Broadcast Editors’ Association |
| BEL | Bharat Electronics Limited |
| BENELUX | Belgium, Netherlands and Luxemburg |
| BHEL | Bharat Heavy Electri-cals Ltd |
| BIFR | Board of Industrial Finance and Reconstruction (Formerly Industrial Reconstruction Finance Board) |
| BIMSTEC | Bangladesh, India, Myanmar, Sri Lanka, Thailand Economic Cooperation |
| BIOS | Basic Input Output System |
| BIS | Bureau of Indian Standards |
| BIT | Binary Digit |
| BPL | Below Poverty Line |
| BPO | Business Process Outsourcing |
| BPR | Business Process Re-engineering |
| bps | bytes per second |
| BRGF | Backward Region Grant Fund |
| BSE | Bombay Stock Exchange |
| BSF | Border Security Force |
| BSNL | Bharat Sanchar Nigam Limited |
