电话号码(Telephone number)是一连串数字的组合，一组号码对应一个电话线，如要拨打至另一方，只需拨对方的对应号码组合。在电话号码刚开始使用时，号码较短，大约只有两三个数字，也只能拨打给附近的电话用户，逐渐地，电话系统越趋发达，涵盖范围达全球，电话号码也相对增长。电话号码除了连接电话，也可连接电脑及传真机。

A telephone number is a sequence of digits assigned to a fixed-line telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network (PSTN) or other private networks. Most telephone numbers are assigned to one telephone line or one mobile telephone, and most lines or mobiles have one number.