Coupling is a connection or joint between two things.

Coupling may also refer to:

• Coupling (physics), when two systems are interacting with each other
  • Rotational–vibrational coupling, occurring when rotation frequency of an object is close to or identical to a natural internal vibration frequency
  • Angular momentum coupling, the combining of quantized angular momentum (e.g., the interaction between two nuclei in nuclear magnetic resonance)
  • Quantum coupling, when quantum states in one of the systems will cause an instantaneous change in all of the bound systems
• Coupling (computer programming), the degree to which each program module relies on each one of the other modules
• Coupling (electronics), the transfer of a signal from one medium or circuit block to another
• Coupling (genetics), a type of genetic linkage
• Coupling (piping), a short length of pipe or tube to connect two pipes or tubes together
• Coupling (probability), a proof technique in probability theory
• Railway coupling, a mechanism for connecting railway rolling stock
• Azo coupling, often called "coupling", an electrophilic substitution reaction
• Coupling reaction, reactions between hydrocarbon fragments in organic chemistry
• Hose coupling, a piece on the end of a hose to connect it to extra hoses or hose appliances
• Coupling track, a term in music recording for a B-side track
• Joint encoding, an audio compression technique in which the redundancy of information between audio channels is reduced; also commonly known as channel coupling or stereo coupling
• Mating or the act of sexual intercourse
• Coupling, the distance formed by the lumbar vertebrae of a horse's back.

• Coupling (British TV series), a British sitcom written by Steven Moffat for the BBC
  • Coupling (American TV series), a short-lived American sitcom based on the British series
  • Coupling (Greek TV series), a short-lived Greek sitcom based on the British series

• Decoupling (disambiguation)
• Coupling rod a device for connecting the driving wheels of a locomotive
• Couple (disambiguation)
• Coupler (disambiguation)
• Short-coupled (disambiguation)
• Uncouple (disambiguation)