B Book
B8ZS Binary 8 Zero Substitution (veja também NRZ, NRZI, AMI)
BA Bachelor of Arts
BACH Business Alliance for Commerce in Hemp
BAFO Best And Final Offer
BARRNet Bay Area Regional Research Network (SF Bay Area)
BASIC Beginner's All-purpose Symbolic Instruction Code
BATSE Burst And Transient Source Experiment (em GRO) (Espacial)
BB Bases on Balls
BB Best of Breed
BB Bunnies and Burrows
BBA Bachelor of Business Administration
BBB Better Business Bureau
BBC British Broadcasting Corporation
BBL Barrel
BBN Bolt, Beranek, and Newman, Inc. (nome de companhia)
BBXRT Broad-Band X-Ray Telescope (Espacial)
BC Battlecars
BC Before Christ
BC British Columbia
BC/BS Blue Cross/Blue Shield
BCD Bad Conduct Discharge
BCD Binary Coded Decimal
BCDIC Binary Coded Decimal Interchange Code
BCE Before the Common Era (substituível por BC)
BCNU Be Seeing You (Jargão usado na Net)
BCP Byte Controlled Protocols
BCPL Basic Combined Programming Language
BCS Bachelor of Commercial Science
BCS Binary Compatibility Standard
BCS Boston Computer Society
BCS British Computer Society
BD Bachelor of Divinity
BD Bank Draft
BD Bills Discounted
BD&D Basic Dungeons & Dragons
BDF Binary Distribution Format
BDT Billing Data Transmitter
BE Bill of Exchange
BEF British Expeditionary Force (veja também AEF)
BELCORE BELL COmmunications REsearch
BEM Bug Eyed Monster
BEM Bug-Eyed Monster (Espacial)
BENELUX BElgium, NEtherlands, and LUXembourg
BER Bit Error Rate
BERT Bit Error Rate Test
BEST Borland Enhanced Support and Training
BF Brought Forward
BFA Bachelor of Fine Arts
BFD Bristol (RI) Fire Department 
BH Black Hole (Espacial)
BH Boot Hill
BHP Brake HorsePower
BICS Building Industry Consulting Services (Telefonia)
BID Bis In Die (duas vezes ao dia)
BIMA Berkeley Illinois Maryland Array (Espacial)
BIOS Basic Input Output System
BIS Business Information System
BISDN Broadband ISDN (q.v.) (Telefonia)
BiSync Binary Synchronous Communications (BSC é preferido) [IBM]
Bit BInary digiT
BITNET Because It's Time Network
BLAST BLocked ASynchronous Transmission
BLERT BLock Error Rate Test
BLF Busy Lamp Field (Telefonia)
BLT Bacon, Lettuce, and Tomato (sanduíche)
BLT BLock Transfer (Instrução)
BLT Branch Less Than (Instrução)
BM Basal Metabolism
BM Bowel Movement
BMA Bank Marketing Association
BMEWS Ballistic Missile Early Warning
BMO Ballistic Missile Office
BMOC Big Man On Campus
BMR Basal Metabolism Rate
BNC Bayonet Neill Concelman (conector eletrônico) (veja também TNC)
BNF Bachus-Naur Form
BO Body Odor
BO Branch Office
BO Buyer's Option
BOC Bell Operating Company
BOD Board Of Directors
BOF Birds Of a Feather
BOM Bill Of Materials
BOOTP Bootstrap Protocol [Internet]
BOQ Bachelor Officers' Quarters
BOS Business Office Supervisor
BOSIX Biin Open System Interface eXtension
BP Blood Pressure
BP British Petroleum
BP British Pharmacopoeia
BPI Bits Per Inch
BPL Boston Public Library
BPL Branch if PLus (Instrução)
BPOE Benevolent and Protective Order of Elks
BPS Bits Per Second
BR Bills Receivable
BR British Rail
BRA Boston Redevelopment Authority
BRI Basic Rate Interface (ISDN) (Telefonia)
BRIEF Basic Reconfigurable Interactive Editing Facility
BRL army Ballistic Research Laboratory
BRS Bibliographic Retrieval Service
BS Bachelor of Science
BS Bill of Sale
BSA Birmingham Small Arms
BSA Boy Scouts of America
BSc Bachelor of SCience
BSC Binary Synchronous Communications (também às vezes BiSync) [IBM]
BSD Berkeley Software Distribution
BSN Bachelor of Science in Nursing
BSS Block Started by Symbol
BSTJ Bell System Technical Journal
BT British Telecom
BTAM Basic Telecommunications Access Method [IBM]
BThU British Thermal Unit (BTU {q.v.} é preferido)
BTL Bell Telephone Laboratories
BTO Bachman Turner Overdrive
BTU British Thermal Unit
BTW By The Way (Jargão usado na Net)
BU Boston University
BUF B-52 bomber ("Big Ugly Fellow") [USAF]
BV Blessed Virgin
BWI Baltimore-Washington International (aeroporto)
BWI British West Indies
BX Base eXchange (veja também PX)
® Pesquisa RXA