| Acronym | Definition |
|---|
| OTN | Oracle Technology Network |
| OTN | Optical Transport Network (Cienna) |
| OTN | On-the-Nose |
| OTN | On The Net |
| OTN | Optical Transport Network |
| OTN | over the Network |
| OTN | Optical Transport Node |
| OTN | Ontario Telemedicine Network (Canada) |
| OTN | Open Transport Network (Apple) |
| OTN | Oncology Therapeutics Network |
| OTN | On the Needles (used by knitters to describe current projects) |
| OTN | Optical Network Terminal |
| OTN | On That Note |
| OTN | Online Television Network |
| OTN | Own-The-Night (military technology) |
| OTN | Our Teen Network (website) |
| OTN | Observer Team to Nigeria (Canadian military) |
| OTN | Oklahoma Telemedicine Network |
| OTN | Oaktown, Indiana (Airport Code) |
| OTN | Oregon Transportation Network |
| OTN | Operating Theater Nurse |
| OTN | Optical Terminal Node |
| OTN | Operational Teletype Network |
| OTN | Otdeleniye Technicheskikh Nauk (Russian: Section for Technical Scientific Works) |
| OTN | Order Tracking Number |