RIR

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:
 * Royal Irish Regiment (1684–1922)
 * Royal Irish Regiment (1992)

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

Political parties

 * React-Include-Recycle, a political party of Portugal

Other uses

 * Rhode Island Red, a breed of chicken