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A registered jack (RJ) is a standardized physical interface — both jack construction and wiring pattern — for connecting telecommunications equipment (commonly, a telephone jack) or computer networking equipment to a service provided by a local exchange carrier or, sometimes, a long distance carrier. The standard designs for these connectors and their wiring are named RJ11, RJ14, RJ45, etc. These interface standards are most commonly used in North America, though some interfaces are used world-wide^{[citation needed]}.

The physical connectors that registered jacks use are of the modular connector type, except RJ21X which is a 25-pair Amphenol connector. For example, RJ11 uses a 6 pin 4 conductor (6P4C) modular plug and jack.

• 1 Naming confusion
• 2 Twisted pair
• 3 History and authority
• 4 International use
• 5 Registered jack types
  • 5.1 Common types
  • 5.2 Uncommon types
  • 5.3 "Unofficial" (incorrect) plug names
  • 5.4 Other compatible Types
• 6 External links

Left to right, RJ connectors: an eight-pin 8P8C plug (used for RJ49, RJ61 and others, but often called "RJ45" because of its outward semblance to the true RJ45), six-pin RJ25 plug, four-pin RJ14 plug (often also used instead of two-pin RJ11), and a four-pin handset plug (also popularly, though incorrectly, called "RJ22", "RJ10", or "RJ9"). The middle two can be plugged into the same standard six-pin jack, pictured.