RIR may refer to:
- Regional Internet registry, nonprofit corporations that administer and register Internet Protocol (IP) address space and Autonomous Systems (AS)
Companies and organizations
- Richmond International Raceway
- Riverside International Raceway
- Royal Irish Regiment, either:
Media and entertainment
- Real Illusions: Reflections, an album by American guitarist Steve Vai
- Rock in Rio, a recurring music festival, originating in Rio de Janeiro, Brazil
- Rush in Rio, a live album by Canadian band Rush
- Rhode Island Red, a breed of chicken
disambiguation page lists articles associated with the title RIR.
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