| Term | Full Form | Category |
|---|---|---|
| ONTC | One Neck Two Chains | Others |
| ONTC | Ontario Northland Transportation Commission | Others |
| ONTC | Optical Networking Technical Committee | Others |
| ONTC | Optical Networks Technology Consortium | Others |
| ONTC | Optimized Newton Tube Carbon | Others |
| ONTC | Original Net Tax Capacity | Others |
| ONTC | Orlando Naval Training Center | Others |