| Abbreviation | Definition |
|---|---|
| NSTSSI | National Security Telecommunications Systems Security Instruction |
| NT | Northern Telecom |
| NTA | National Telecom Alliance |
| NTA | Nebraska Telecommunications Association |
| NTC | National Telecommunication Corporation |
| NTC | National Telecommunications Commission |
| NTC | National Telecommunications Company |
| NTCN | National Telecommunications Coordinating Network |
| NTD | No Transmit Diversity |
| NTDC | Nevada Telecommunity Development Corporation |
| NTIA | National Telecommunications and Information Administration |
| NTL | No Telephone Line |
| NTL | Nokia Telecommunication Limited |
| NTL | Northern Telecomminications Line |
| NTML | NEC Telecom MODUS Ltd |
| NTNA | National TETRA Numbering Administrator |
| NTOE | Network Telco Operator Exposure |
| NTP | Northern Telecom Products |
| NTQ | New Telecom Quarterly |
| NTRC | National Telecommunications Regulatory Commission |