| อักษรย่อ | คำเต็ม | รายละเอียด |
| B | Bachelor | |
| B-R-B | Be Right Back | |
| B.A. | Bachelor of Arts | |
| B.C. | Before Christ | |
| B.E / B.Eng | Bachelor of Engineering | |
| B.Ind.Tech. | Bachelor of Industrial Technology | |
| B.O. | Branch Office | |
| B.S. / B. Sc., | Bachelor of Science | |
| B/W | Between | |
| B2B | Business to Business | |
| B4 | Before | |
| B4U | Before You | |
| BAC | Bank for Agriculture and Agricultural Cooperatives | |
| BAY | Bank of Ayudthaya | |
| BBA | Bachelor of Business Administration | |
| BBC | British Broadcasting Corporation | |
| BBK | Bangkok Bank | |
| BBL | Bangkok Bank Public Company Limited | |
| BBM | BlackBerry Messenger | |
| BC | Because | |
| Bc. . | Bachelor of science | |
| BENELUX | Belgium, Netherlands, Luxembourg group of countries | |
| BFF | Best Friend Forever | |
| BG | Big grin | |
| BIOS | Basic Input Output System | |
| BIS | British Information Service | |
| BITEC | Bangkok International Trade and Exhibition Centre | |
| Biz | Business | |
| Bldg. | Building | |
| BMA | Bangkok Metropolitan Administration | |
| BMTA | Bangkok Mass Transit Authority | |
| BOD | Biochemical oxygen demand | |
| BOI | Board of Investment | |
| BOTOH | But on the other hand | |
| BP | Blood Pressure | |
| BPH | Benign Prosthetic Hypertrophy | |
| BRB | Be Right Back | |
| BTB | BankThai Bank | |
| BTDT | Been there, done that | |
| BTS | Bangkok Mass Transit System | |
| BTU | British Thermal Unit | |
| BTW | By The Way | |
| Bus. Admin. | Business Administration | |
| BW | Body Weight | |
| Bx | Biopsy | |
| BYOB | Bring Your Own Beer | |
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