A twisted pair cable is a type of communications cable that consists of two conductors of a single circuit twisted together. The twisting of the wires helps to improve electromagnetic compatibility, reduce electromagnetic radiation from the pair, and minimize crosstalk between neighboring pairs. The idea behind using a twisted pair is that the currents induced in each of the two wires are very nearly equal, and the twisting ensures that the two wires are on average the same distance from the interfering source and are affected equally. Twisted pair cables can be used as a balanced line, which as part of a balanced circuit can greatly reduce the effect of noise currents induced on the line by coupling of electric or magnetic fields.

There are two types of twisted pair cables: shielded twisted pair (STP) and unshielded twisted pair (UTP). STP is enclosed in a shield that functions as a ground, while UTP is not shielded. Twisted pair cables are classified into different categories such as Cat5e, Cat6, Cat7, Cat8 cables based on their electrical characteristics.

Twisted pair cables are commonly used in networking and communication, for example, in telephone lines, Digital Subscriber Line (DSL), and local area networks. They are also used for horizontal wiring in LAN installations because they are less expensive than coaxial cable.