| Rank | Abbreviation | Meaning |
|---|
| ***** | OCTC | Open Circuit Time Constant
| |
| **** | OCTC | Office of the Chief Tax Counsel
| |
| **** | OCTC | Office of the Chief Trial Counsel
| |
| *** | OCTC | Old Capitol Town Center
| |
| *** | OCTC | Oxford Cognitive Therapy Centre
| |
| *** | OCTC | Ottawa Children's Treatment Centre
| |
| *** | OCTC | Ontonagon County Telephone Company
| |
| ** | OCTC | Orange County Track Club
| |
| ** | OCTC | Oakland City Teacher Corps
| |
| ** | OCTC | Old Creamery Theatre Company
| |
| * | OCTC | Owensboro Community and Technical College
| |
| * | OCTC | Orange Cycle and Triathlon Club
| |
| * | OCTC | Ohio Chemistry Technology Council
| |
| * | OCTC | Orange County Transfer Consortium
| |
| * | OCTC | Orange County Transgender Coalition
| |
| * | OCTC | Orange County Triathlon Club
| |
| * | OCTC | Orange County Transportation Council
| |
| * | OCTC | Orangeburg Calhoun Technical College
| |
| * | OCTC | Ortigas Center Tourism Council
| |
| * | OCTC | Orange County Transportation Commission
| |
| * | OCTC | Ophthalmic Clinical Trials Center
| |
| * | OCTC | Obsessive Compulsive Thoughts Checklist
| |