| 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 |