IOR

• Independent Order of Rechabites, promoting alcohol abstinence
• I.O.R. (Întreprinderea Optică Română), optics company of Romania
• IOR (formerly Inland Oil Refiners), owner of the Eromanga Refinery in Australia
• Institute of Refrigeration, a UK scientific charity and membership organisation

• Inclusive or, in logic
• Index of refraction, in optics
• Inhibition of return, a phenomenon in visual perception
• Interoperable Object Reference, a reference to a CORBA or RMI-IIOP object

• Importer of record, in import and export
• India Office Records, of the former administration of India

• International Offshore Rule, an early handicapping system for yacht racing
• Istituto per le Opere di Religione (Institute for Religious Works), the "Vatican Bank"

• Inishmore Aerodrome (IATA airport code), Ireland

• Indian Ocean Rim Association (IORA)

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