| ORTC | Object Real-Time Communications 
| Others |
| ORTC | Object Real-Time Communications (computer community group)
| Others |
| ORTC | Off Road Trailers Club
| Others |
| ORTC | Ohio River Trail Council
| Others |
| ORTC | Old Republic Title Company
| Others |
| ORTC | Ontario Rehabilitation Technology Consortium (Canada)
| Others |
| ORTC | Operational Readiness Training Complex
| Others |
| ORTC | Overall Roadmap Technology Characteristics (International Technology Roadmap for Semiconductors
| Others |