| Abbreviation | Definition |
|---|---|
| HAYSTAQ | HAve You STored Answers to Questions yet? |
| HBV | Hierarchical Bounding Volumes |
| HCC | Heavy Computing Consortium |
| HCC | Human-Centered Computing |
| HCI | Handgun Control Inc |
| HCI | Holistic Control Information |
| HCL | Hardware Compatibility List |
| HCL | Hue, Chroma, and Luminance |
| HCPCS | Healthcare Common Procedure Coding System |
| HCR | Hard Core Ruleset |
| HCS | Hybrid Computer System |
| HD | Hard Drive |
| HD | Help Desk |
| HD | Host Directory |
| HDA | Head-Disk Assembl |
| HDA | High Definition Audio |
| HDBV | Host Data Base View |
| HDC | Hard Disk Controller |
| HDCP | High Dependability Computing Project |
| HD-DVD | High Definition DVD |