ONTC
| Acronym | Definition |
|---|---|
| ONTC | Ontario Northland Transportation Commission (Government of Ontario, Canada) |
| ONTC | Optical Networking Technical Committee |
| ONTC | Optical Networks Technology Consortium |
| ONTC | One Neck, Two Chains (hip hop blog) |
| ONTC | Orlando Naval Training Center |
| ONTC | Office of NATO Terminology Coordination |
| ONTC | Office of the Navajo Tax Commission (St. Michaels, Arizona) |
| ONTC | Ontario National Training Centre |
| ONTC | Order of the New Crusaders |