| Opus Media, LLC | |
| Opus One | Arizona |
| Opus Regulatory | |
| Opus Security | |
| Opus Technology Ltd | |
| Opus Three, LLC | California |
| OpusAI | Texas |
| OpusClip | |
| Opvizor | Texas |
| Oqory, Inc. | |
| ORA | California |
| Ora Apps, Inc. | New Jersey |
| Ora Biomedical, Inc. | |
| Ora, Inc. | Massachusetts |
| OraChrom, Inc. | Massachusetts |
| Oracle | Texas |
| Oracle Applications & Technology Users Group | Georgia |
| Oracle NetSuite | Texas |
| Oracle Nova | |
| Orafox | |
| Oragenics, Inc. | Florida |
| Oral Roberts University | Oklahoma |
| OramaSearch, Inc. | |
| Orange Charger, Inc. | |
| Orange Coast College | California |
| Orange Coast Websites, Inc. | |
| Orange Comet, Inc. | California |
| Orange Computers, Inc. | Missouri |
| Orange County Linux Users Group | California |
| Orange County Online | California |
| Orange County SEO Company, Inc. | California |
| Orange County SEO Experts | California |
| Orange County Startup Council | California |
| Orange County Startup News Blog | California |
| Orange Digital Technologies | |
| Orange Egg Advertising, LLC | |
| Orange Fab | California |
| Orange Graphics | |
| Orange Label Design Studio | California |
| Orange Loops | Massachusetts |
| Orange Management Solutions | |
| Orange Rock Media | |
| Orange SEO | |
| Orange Silicon Valley | California |
| Orangeburg-Calhoun Technical College | South Carolina |
| Orangecoat | South Carolina |
| OrangeCountyComputer, Inc. | California |
| Oranged Software, LLC | Illinois |
| Orangedox Media, Inc. | |
| OrangeFS | |