| B5 | Big-5 | 大五(码) |
| BALMOD | Balanced Modulator | 平衡调制器 |
| BALTR | Balancing Transformer | 平衡变压器 |
| BALUN | Balanced-UNBalanced | 平衡-不平衡 |
| BALUN | Balanced Unit | 平衡单元(装置) |
| BAM | Broadcasting Amplitude Modulation | 调幅广播 |
| BASIC | Beginner's All-purpose Symbolic Instruction Code | 初学者的通用符号指令码(基础语言) |
| BB | Base Band | 基(本频)带 |
| BBS | Bulletin Board System | (电子)公告牌系统 |
| BC | Broadcast | 广播 |
| BCC | Blind Courtesy Copy | (电子邮件)盲式副本 |
| BCST | Broadcast | 广播 |
| BF | Beat Frequency | 拍频，差频 |
| BFO | Beat Frequency Oscillator | 拍频振荡器，差频振荡器 |
| BFSK | Binary Frequency Shift Keying | 二进制移频键控 |
| BFT | Binary File Transfer | 二进制文件传输 |
| BH | Busy Hour | 忙时 |
| BN | Balancing Network | 平衡网络 |
| BN | Beacon | 信标 |
| BP | Bandpass | 带通 |
| BP | Break Point | 断点 |
| BISYNC | Binary Synchronous Communications Protocol | 二进制同步通信协议 |
| BMP | BitMap | 位图 |
| BOF | Birds Of Feather | 专题讨论小组 |
| bps | bits per second | 位每秒钟 |
| BRI | Basic Rate Interface | 基本速率接口 |