ODA : Offical Development Assistance 공적개발원조
OECD : Organization for Economic Cooperation and Development 경제협력개발기구
OEM : Original Equipment Manufacturer 주문자상표 부착생산
OMR : Optical Mark Reader 광학마크판독기
ONTA : Office of National Tax Administration 국세청
OPEC : Organization PEtroleum Export Countries 석유수출국기구
OS : Operating System 운영체계
OST : Original Sound Track 오리지널사운드트랙
OTC : Over The Counter 창구판매