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OIROnline Image Resizer
OIROperation Inherent Resolve (combat operations)
OIROptical-Infrared (astronomy)
OIROxford International Review (journal; UK)
OIROffice of Insurance Regulation
OIROrder Instituting Rulemaking (California)
OIROffice of Institutional Research
OIROccupational Injury Rate (workers)
OIROnline Insertion and Removal (Cisco)
OIROnline Information Review (journal)
OIROld Irish
OIROracle I-Recruitment
OIRObject Information Repository
OIROnline Insertion and Removal
OIROperational Intelligence Requirements (US DoD)
OIROffice of International Research (various locations)
OIROffice of Independent Review (Los Angeles County, California)
OIROffice of Information Resources
OIROffice of Instructional Resources
OIROffice of Intramural Research
OIROther Intelligence Requirements (US DoD)
OIROfficial International Rules (Mahjong)
OIROptical Interface Rates
OIROrganización Internacional Para Los Refugiados (Spanish: International Organization for Refugees; UN)
OIROffice of Internal Review
OIROrganization for Industrial Research
OIROptimal Information Rate
OIROxford Investment Research (UK)
OIROther Information Requirement
OIROfficial International Reserves (Department of Finance; Canada)
OIROperational & Information Requirements