INR

• Initiator element, a core promoter in genetics
• International normalized ratio of prothrombin time of blood coagulation
• Interventional neuroradiology, a minimally invasive medical speciality

• Bureau of Intelligence and Research of the U.S. State Department
• Institute of National Remembrance, a Polish research institute
• Institute for Nuclear Research of the Russian Academy of Sciences
• Instituto Nacional de Rehabilitación, a public health institute in Mexico
• {{lang|fr|Institut national belge de radiodiffusion}}, French name of Belgium's National Institute of Radio Broadcasting (1930–1960)

• Indian rupee, by ISO 4217 currency code

• Independent National Radio, the official term for national commercial radio stations in the United Kingdom
• McKinley National Park Airport, Alaska, USA, FAA identifier
• International Railway (New Brunswick) A former rail line in the province of New Brunswick, in Canada

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