RI

• Arterial resistivity index
• Chicago, Rock Island and Pacific Railroad
• IR (disambiguation)
• Indonesia
• Isaac ben Samuel
• Italian Radicals
• Lee (Korean surname)
• Li (unit)
• Raffles Institution
• Referential integrity
• Refractive index
• Refugees International
• Rehabilitation International
• Reputation Institute
• Residual income
• Rex Imperator
• Rhode Island
• Rhombicosahedron
• Ri (administrative division)
• Ri (kana)
• Ri, Orne
• Ring Indicator
• Riri (disambiguation)
• Ris (disambiguation)
• Rock Island District
• Rotary International
• Royal Institute of Painters in Water Colours
• Royal Institution
• Russia Insider
• Rí
• Solfege
• TVRI
• Tigerair Mandala
• gender reform in Esperanto
• svara