| Acronym | Meaning |
 | HAM | Height Adjustment Maneuver |
 | HAP | Hardware Allocation Panel |
 | HAS | Holddown Alignment Support |
 | HAS | Hydraulic Actuation System |
 | HAS | Hydrogen Actuation System |
 | HAST | High Altitude Supersonic Target |
 | HAW | Hawaii (STDN) |
 | HB | Handbook |
 | HB | High Bay |
 | HBR | High Bit Rate |
 | HBT | Heflex Bio-Engineering Test |
 | HBW | Hot Bridge Wire |
 | HC | Hand Controller |
 | HC | Head Count |
 | HC | Hybrid Computer |
 | HCED | Hand Controller Engage Driver |
 | HCF | High Cycle Fatigue |
 | HCF | HIM Configuration File |
 | HCL | Horizontal Centerline |
 | HCM | Hard Copy Module |
 | HCMM | Heat Capacity Mapping Mission |
 | HCR | High Cross Range |
 | HCSI | Hughes Communications Services |
 | HCSL | Hybrid Computation And Simulation Laboratory |
 | HCU | Hydraulic Charging Unit |
 | HCV | Hydrogen Check Valve |
 | HD | Heavy Duty |
 | HD | Highly Desirable |
 | HD | Hoiddown |
 | HD | Horizontal Drain |
 | HD | Hydrogen Drain |
 | HDA | Housekeeping Data Acquisition |
 | HDC | Hasselblad Data Camera |
 | HDC | HYbrid Device Controller |
 | HDDR | High-Density Digital Recorder |
 | HDG | Heading |
 | HDP | Holddown Post |
 | HDQ | Headquarters |
 | HDR | High Data Rate |
 | HDR | High Data Rate |
 | HDRA | High Data Rate Assembly |
 | HDRM | High Data Rate Multiplexer |
 | HDRR | High Data Rate Recorder |
 | HDRR | High-data-rate Recorder |
 | HDRSS | High Data Rate Storage System |
 | HDS | Hardware DescriPtion Sheet |
 | HDST | Headset |
 | HDW | Hardware |
 | HDWE | Hardware |
 | HE | Heat Exchange (Exchanger) |