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Ir, ir or IR may refer to:

IR may refer to:

Arts and entertainment[edit]

Businesses and organizations[edit]


Other businesses and organizations[edit]


  • Incidence Rate, in market research
  • Interest rate, or (when referring to an asset class) interest rate derivative
  • Information ratio, when referring to risk-adjusted returns of a financial security
  • Investor relations, a management responsibility in which companies disclose information for regulatory compliance and for bond/share-holders to make investment judgments

Science and technology[edit]

Biology and medicine[edit]


Other uses in science and technology[edit]

  • Infrared, a portion of the electromagnetic radiation spectrum
  • Impulse response, an output function of a dynamic system presented with a brief input signal
  • Ionizing radiation
  • Iridium (chemical symbol Ir), the 77th element
  • Issledovatelskiy reaktor, Research reactor, nuclear reactor some were produced by the Russian N.A. Dollezhal Research and Development Institute of Power Engineering (JSC NIKIET)

Other uses[edit]

See also[edit]