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