IFR (disambiguation)
# IFR (disambiguation)

IFR is instrument flight rules, rules for when flight by outside visual reference is not safe.

IFR may also refer to:

* Infection fatality rate in epidemiology
* Ideal final result, an engineering design goal
* In-flight refueling
* Institute of Food Research, an agricultural and food science research institution
* Integral fast reactor, a nuclear reactor design
* International Federation of Robotics
* International Financing Review, a financial magazine
* International Fleet Review, various publications of the same name
* Instantaneous wave-free ratio (iFR), a diagnostic medical test used in coronary artery stenosis assessment
