Temple of Olympian Zeus (Athens)
List of Olympic medalists in athletics (men)
List of Olympic medalists in athletics (women)
List of Olympic medalists in baseball
List of Olympic medalists in basketball
Office of the United Nations High Commissioner for Human Rights
Official Monster Raving Loony Party
Combined oral contraceptive pill
Otto Wilhelm Hermann von Abich
Organization of the Communist Party of the Soviet Union
Orthogonal frequency-division multiplexing
Oliver Hazard Perry class frigate
Object-oriented programming language
List of organizations with .INT domain names
Organization of American States
Office international des épizooties