| Abbreviation | Definition |
|---|---|
| GTT | Global Title Translation |
| GTTD | Gigabit To The Desktop |
| GU | Global Unshared |
| GUI | Graphics User Interface |
| GUIDE | Global Uniform Interoperable Data Exchange |
| GUN | Generally Unstable Network |
| GVA | Guest Virtual Address |
| GVRP | GARP VLAN Registration Protocol |
| GW | Gateway |
| GW | Global Wait |
| GWCN | GateWay Core Network |
| GWIP | Government Wideband Internet Protocol |
| H | Hub |
| HABAC | Hybrid ATM Bus Access Controller |
| HAIPE | High Assurance Internet Protocol Encryptor |
| HAM | Hardware Accelerated Modem |
| HAM | Host Adapter Module |
| HAN | Home Area Network |
| HAPPEN | Healthcare Associates Providing Positive Education and Networking |
| HARP | Hybrid Array Ring Processor |