串列线路互联网协定（英语：Serial Line Internet Protocol，缩写为SLIP，又译为串行线路IP协议），又称为串列线路接口协定（英语：Serial Line Interface Protocol）、串列协定，一种互联网协定，用于串行端口和调制解调器之间的连接，可以创建起广域网络。在 RFC 1055 中定义，但它不是互联网的标准协定。在计算机中，SLIP已经广泛的被点到点协议（PPP）所取代，因为PPP有许多更好的特点，并且不需要在连接创建前进行IP地址的配置。但在单片机中，由于SLIP有非常小的包装头，所以它仍是首选的封装IP包的方式。

The Serial Line Internet Protocol (also SLIP) is an encapsulation of the Internet Protocol designed to work over serial ports and modem connections. It is documented in RFC 1055. On personal computers, SLIP has been largely replaced by the Point-to-Point Protocol (PPP), which is better engineered, has more features and does not require its IP address configuration to be set before it is established. On microcontrollers, however, SLIP is still the preferred way of encapsulating IP packets due to its very small overhead.