RH, Rh, rH, or rh may refer to:

Companies

  • Red Hat, an American software company
  • Republic Express Airlines (IATA designator), a cargo airline in Indonesia
  • RH (company), an American furniture chain formerly known as Restoration Hardware

Science and technology

  • Relative humidity, the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature
  • Releasing hormone
  • Reproductive health
  • Rh blood group system (Rhesus factor), a classification to describe blood types in humans
  • Rhodium, symbol Rh, a chemical element
  • R<sub>H</sub>, the Rydberg constant for hydrogen
  • Riemann hypothesis, an important unsolved problem in mathematics
  • Adobe RoboHelp, an Adobe software

Places

  • RH postcode area, in the UK
  • , an official name of Croatia in Croatian

Other uses

  • Rh (digraph)
  • The Right Honourable, an honorific preceding a name in the UK
  • Radical honesty, the practice of always being completely honest and refraining from telling even white lies
  • DZRH News Television, a news channel in the Philippines previously known as RHTV.
  • Richmond Hill line (RH), of the GO Transit rail network in Ontario, Canada

See also

  • DZRH, a Philippine radio station
  • Royal Hospital (disambiguation)