| TCN | tour code number | 旅游代号编码 |
| TCN | Third Country National | 第三国国民 |
| TCN | Train Communication Network | 列车通信网络 |
| TCN | Take Care Now Ltd (UK healthcare provider) | Take Care Now Ltd（英国医疗服务提供商） |
| TCN | Transportation Control Number | 运输控制编号 |
| TCN | Temporary Change Notification | 临时变更通知 |
| TCN | Technician Corporation | 技术人员公司 |
| TCN | Terrestrial Communications Network | 地面通信网络 |
| TCN | Trigeminocervical Nucleus | 三叉神经颈核 |
| TCN | Test Case Notation (ISO) | 测试用例符号（ISO） |
| TCN | Tactical Component Network | 战术组件网络 |
| TCN | Travel Card Number (Sprint) | 旅行卡号（Sprint） |
| TCN | Tactical Air Navigation (TACAN) | 战术空中导航（TACAN） |
| TCN | Trans-Country National | 跨国公司 |
| TCN | Topology Change Notification | 拓扑更改通知 |
| TCN | Think College Now | 立即思考大学 |
| TCN | Troop Contributing Nations | 部队派遣国 |
| TCN | Tracking Control Number | 跟踪控制编号 |
| TCN | Theatre Club Nanyang | 南洋戏剧俱乐部 |
| TCN | The Computer Nerd | 电脑迷 |
| TCN | Twin Cities NSP | 双城NSP |
| TCN | Tele Norte Celular Participa | Tele Norte Celular参与者 |
| TCN | The Texas Classified Network | 德克萨斯州保密网络 |
| TCN | Tehuacan, Mexico | 墨西哥特瓦坎 |
| TCN | Tacoma Commercial Network | 塔科马商业网络 |
| TCN | Test Change Notice | 测试更改通知 |
| TCN | Turbo Chat Network | Turbo聊天网络 |
| TCN | The Cartoon Network | 卡通网络 |
| TCN | Technical Change Notice | 技术变更通知 |
| TCN | The Claymore Nation (gaming) | 克莱莫尔国家（游戏） |
| TCN | Travel Change Notification | 行程变更通知 |
| TCN | Transaction Control Number | 交易控制编号 |
| TCN | tetraycline | 四环素 |
| TCN | Third Country Nation | 第三国 |
| TCN | Trials Competition Newspaper | 选拔赛报纸 |
| TCN | Tactical Control Network | 战术控制网络 |
| TCN | Terran Confederation News | 人族联盟新闻 |
| TCN | transparent content negotiation | 透明内容协商 |
| TCN | Task Control Number | 任务控制编号 |
| TCN | Transaction Control Network | 交易控制网络 |
| TCN | Third Country National(s) | 第三国国民 |
| TCN | Troubleshooting Cisco Network | Cisco网络故障排除 |
| TCN | Theater Communications Network | 剧院通信网络 |
| TCN | Tracing Change Notice | 跟踪变更通知 |
| TCN | Traffic Control Number | 交通管制号码 |