| Abbreviation | Definition |
|---|---|
| HATS | Host Access Transformation Services |
| HBA | High Bandwidth Access |
| HBD | Honeywell Bridge Device |
| HBFW | Host-Based Firewalls Rules |
| HBNA | Hellenic Business Networking Association |
| HBOS | High-Bandwidth Optical Service |
| HBP | Held By Production |
| HCD | Host Controller Device |
| HCF | Host Control Function |
| HCF | Host Controller Function |
| HCI | Host Controller Interface |
| HD | Half Duplex |
| HDC | Hierarchical Domain Controller |
| HDDIP | Hard Drive Disk (HDD) IP-based |
| HDI | Half Duplex Interface |
| HDLC | High-level Data Link Control |
| HDN | Hosting Deactivation Notice |
| HDR | High Data Rate |
| HDS | Hierarchical Data Storage |
| HDSL | High-bit-rate Digital Subscriber Line |