Slip or SLIP may refer to:

• Slip (ceramics), an aqueous suspension of minerals
• Slip (telecommunication), a positional displacement in a sequence of transmitted symbols
• Slip, the difference in speed between the frequency supplied to an induction motor and rotor shaft speed
• Slip, a type of rail switch
• Slipway, a ramp on the shore by which ships or boats can be moved to and from the water
• Slip, a branching of a muscle in anatomy

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.