IR
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IR or ir may stand for:
- Indian Railways
- Information Retrieval
- Infrared
- Instrument Rating
- international relations
- Iran (ISO country code)
- Iridium (Ir), chemical symbol for the chemical element
- Iran Air (IATA alpha code designator)
- investor relations
- Ingenieur (Ir)
- Irish Rail
- Ingersoll-Rand Company Limited (NYSE trading symbol)
- Independent-Republican Party of Minnesota