| Acronym | Meaning |
 | OPLAN | Operation Plan (also OpPlan) |
| O | Oberst - Observer - Obstacle - Octal - Officer - Official - Oh - Operational - Operator - Oprah (magazine) - Outstanding -Oxygen |
| AQ | American Samoa (FIPS 10-4 Territory Code) - Antarctica (ISO 3166 Digram) |
| SDRAM | Synchronous Dynamic Random-Access Memory (ess-dee-ram) |
| UYU | Uruguayan Peso Uruguayo (ISO 4217 Currency Code) |
| USAPATRIOT | Uniting And Strengthening America By Providing Appropriate Tools Required To Intercept And Obstruct Terrorism |
| YSA | Youth Service America - Young Socialist Alliance |
| EOG | ElectroOculoGraphy |
| GLUT | OpenGL Utility Toolkit |
| IMR | Inzhenernaya Mashina Razgrazhdeniya (Russian ?????????? ?????? ???????????? |
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