| H | Hydrogen |
| HAADF-STEM | High Angle Annular Dark Field Scanning Transmission Electron Microscopy |
| HAP | Hazardous Air Pollutant |
| HARI | High Aspect Ratio Inspection |
| HARP | High Aspect Ratio Process |
| HAST | Highly Accelerated Stress Testing |
| HAZCOM | Hazard Communication Standard |
| HB | Horizontal Bridgeman Crystal |
| HBM | Human Body Model |
| HCE | Hot Carrier Effects |
| HCI | Hot Carrier Injection |
| HCl | Hydrochloric Acid |
| HCM | Hollow Cathode Magnetron |
| HCMOS | High Density Complementary Metal-oxide Semiconductor |
| HCS | Hot-carrier Stress |
| HD | High Density |
| HDD | High Density Disk |
| HDL | Hardware Description Language |
| HDP | High Density Plasma |
| HDPE | High Density Polyethylene |
| He | Helium |
| HE | High Energy |
| HEM | High Efficiency Matching |
| HEPA | High Efficiency Particulate Air |
| HEX | Heat Exhaust |
| Hf | Hafnium |
| HF | Hydrofluoric Acid |
| HFRR | Hydrofluoric Acid Reprocessor Return System |
| Hg | Mercury |
| HIBS | Heavy Ion Backscattering Spectrometry |
| HIM | Heated Injection Manifold |
| HiPOx | High-pressure Oxygen |
| HLF | Horizontal Laminar Flow |
| HMDS | Hexamethyldisilizane |
| HMIS | Hazardous Materials Inventory Statement |
| HMMP | Hazardous Materials Management Plan |
| HMOS | High Performance MOS |
| HMOS | High-density MOS |
| Ho | Holmium |
| HOMER | Hazardous Organic Mass Emission Rate |
| HOPG | Highly Oriented Pyrolitic Graphite |
| HP | High Purity |
| HPCC | High Performance Computing And Communicating |
| HPEM | Hybrid Plasma Equipment Model |
| HPI | High Pressure Isolation |
| HPL | High Performance Logic |
| HPLC | High Performance Liquid Chromatography |
| HPM | Hazardous Production Materials |
| HPM | High Purity Metal |
| HPM | Hydrochloric Peroxide Mix |
| HPV | High Pressure Vent |
| HRA | Human Reliability Analysis |
| HRR | High Ramp Rate |
| HRTEM | High Resolution Transmission Electron Microscopy |
| HSFR | High Spatial Frequency Roughness |
| HSMS | High Speed Messaging Services |
| HSQ | Hydrogen Silsesquioxane |
| HTDR | High Temperature Data Retention |
| HTF | High Temperature Film |
| HTH | Head-to-head |
| HTL | High Threshold Logic |
| HTO | High Temperature Oxide |
| HTOL | High Temperature Operating Life |
| HTRB | High Temperature Reverse Bias |
| HTU | Height Of Transfer Unit |
| HUPW | Hot Ultrapure Water |
| HV | High Voltage |
| HVAC | Heating, Ventilating, And Air Conditioning |
| HVM | High Volume Manufacturing |
| HVM/EH | High Volume Manufacturing And Exception And Handling |
| HVP | High Volume Production |
| HWS | Heating Water System |
| HY | Hybrid |