IRR

IRR or Irr may refer to:

Finance

• Implied repo rate, in the futures market
• Internal rate of return, a profitability metric
• Iranian rial, currency of Iran by ISO 4217 code
• Interest rate risk, financial risk from fluctuating interest rates

Organisations

• Incident Response Regiment (Australia), an emergency response agency
• Institute of Race Relations, a policy institute
• Institute for Religious Research, an apologetics organization
• Iraqi Republic Railways, a transportation operator
• South African Institute of Race Relations, a think tank

Science and technology

• Image rejection ratio, a radio metric
• Interrupt Request Register, a register used for managing interrupts in programmable interrupt controllers
• Internet Routing Registry, a network routing database
• Irregular galaxy, a galaxy that does not have a distinct regular shape

Other

• Incidence rate ratio, a statistic derived from a Poisson regression model
• Individual Ready Reserve, a personnel status of the United States Military
• Infusion-related reaction or infusion reaction, a form of systemic inflammatory response syndrome caused by some diseases or drugs
• Inner Ring Road (disambiguation)
• Inter-rater reliability