ROI

Roi

• Roi, a 1993 song by The Breeders in their album Last Splash
• Roi Et and Roi Et province in Thailand
• Roi Klein, an Israeli Defense major
• Roi-Namur, an island in the Marshall Islands
• "Le Roi" (French for "the King"), a nickname for French basketball player Antoine Rigaudeau
• USS Roi (CVE-103), a US war ship

ROI

• Return on Investment or Rate of return, used to evaluate the efficiency of an investment in finance and economics
• Reactive oxygen intermediates, in biology
• Region of interest, for example in image analysis or image processing
• Release of Information, in Health Information Management
• Republic of Ireland
• Republic of India
• Republic of Indonesia
• Residue on ignition, in analytical chemistry
• Romská občanská iniciativa (English: Roma Civic Initiative), a Roma political party based in Slovakia and formerly in the Czech Republic and Czechoslovakia
• Royal Institute of Oil Painters
• Russian Olympiad in Informatics, an annual informatics competition for secondary school students in Russia
• Run of Issue, used in magazine publishing to signify subject mentioned or used in all of a particular issue.