| H-CI | Hylleraas-configuration Interaction | - | Computer Acronyms(common) |
| H-FABP | Heart Fatty Acid-binding Protein | - | Computer Acronyms(common) |
| HAA | Haloacetic Acid | - | Computer Acronyms(common) |
| HAA | Heterocyclic Aromatic Amine | - | Computer Acronyms(common) |
| HAADF | High-angle Annular Dark-field | - | Computer Acronyms(common) |
| HAART | Highly Active Antiretroviral Therapy | - | Computer Acronyms(common) |
| HAB | Harmful Algal Bloom | - | Computer Acronyms(common) |
| HAB | High-Alumina Basalt | - | Computer Acronyms(common) |
| HABR | Hybrid Anaerobic Baffled Reactor (for Wastewater Treatment) | - | Computer Acronyms(common) |
| HAC | High Alumina Cement | - | Computer Acronyms(common) |
| HAC | Hydrogen-assisted Cracking | - | Computer Acronyms(common) |
| HACCP | Pathogen Reduction And Hazard Analysis Critical Control Point | - | Computer Acronyms(common) |
| HACS | Hazard Assessment Computer System | - | Computer Acronyms(common) |
| HAD | High Aluminum Defect | - | Computer Acronyms(common) |
| HAD | Hollow Anode Discharge | - | Computer Acronyms(common) |
| HADD | Highest Average Daily Dose | - | Computer Acronyms(common) |
| HADES | High Activity Disposal Exptl. Site [for Radioactive Waste] | - | Computer Acronyms(common) |
| HADS | Health Assessment Documents | - | Computer Acronyms(common) |
| HAEC | Human Aortic Endothelial Cell | - | Computer Acronyms(common) |
| HAEC | Human Artificial Episomal Chromosome | - | Computer Acronyms(common) |
| HAF | Halogen Acid Furnaces (for Burning Halogenated Wastes | - | Computer Acronyms(common) |
| HAFID | Hydrogen Atmosphere Flame Ionization Detector | - | Computer Acronyms(common) |
| HAGAR | High Altitude Gas Analyzer | - | Computer Acronyms(common) |
| HAGIS | Headspace Analysis Gas-phase Infrared Spectroscopy | - | Computer Acronyms(common) |
| HAI | Histol. Activity Index | - | Computer Acronyms(common) |
| HAISP | High Altitude Interactive Science Platform | - | Computer Acronyms(common) |
| HAL | Health Advisory Level | - | Computer Acronyms(common) |
| HALOE | Halogen Occultation Experiment | - | Computer Acronyms(common) |
| HALS | Hindered-amine Light Stabilizers | - | Computer Acronyms(common) |
| HALT | Hydrate Addition At Low Temperature (for Sulfur Dioxide Removal From Flue Gases) | - | Computer Acronyms(common) |
| HAM | Hydrogenic Atoms In Molecules | - | Computer Acronyms(common) |
| HAM/N | Hydrogenic Atoms In Molecules | - | Computer Acronyms(common) |
| HAMA | Human Anti-mouse Antibody | - | Computer Acronyms(common) |
| HAMR | Heat Assisted Magnetic Recording | - | Computer Acronyms(common) |
| HAMS | Helium Atoms Measurement System | - | Computer Acronyms(common) |
| HAN | Halogenated Acetonitrile(s) | - | Computer Acronyms(common) |
| HAN | Heavy Aromatic Naphtha | - | Computer Acronyms(common) |
| HAN | Hydroxylamine Nitrate (salt) | - | Computer Acronyms(common) |
| HANS | Heavy Aromatic Naphtha Solvent | - | Computer Acronyms(common) |
| HAO | Hybrid Atomic Orbital | - | Computer Acronyms(common) |
| HAO | Hydrogenic Atomic Orbital | - | Computer Acronyms(common) |
| HAOM | Hybrid Atomic Orbital Model | - | Computer Acronyms(common) |
| HAP | Hazardous Air Pollutants | - | Computer Acronyms(common) |
| HAPEM | Hazardous Air Pollutant Exposure Model | - | Computer Acronyms(common) |
| HAPEMS | Hazardous Air Pollutant Enforcement Management System | - | Computer Acronyms(common) |
| HAPEX | Hydrological And Atmospheric Pilot Experiment | - | Computer Acronyms(common) |
| HAPPS | Hazardous Air Pollutant Prioritization System | - | Computer Acronyms(common) |
| HAPS | Hazardous Air Pollutants | - | Computer Acronyms(common) |
| HARA | Hazard Assessment By Risk Analysis | - | Computer Acronyms(common) |
| HARM | Hazardous Atmospheric Release Model | - | Computer Acronyms(common) |
| HARMS | High Aspect Ratio Microstructure | - | Computer Acronyms(common) |
| HART | Highway Addressable Remote Transducer [Rosemount | - | Computer Acronyms(common) |
| HASE | Hydrophobically Modified Alkali-swellable Emulsion | - | Computer Acronyms(common) |
| HASI | Huygens Atmospheric Structure Instrument | - | Computer Acronyms(common) |
| HASL | Hypothetical Active Site Lattice | - | Computer Acronyms(common) |
| HASL | Hot Air Solder Leveling [electronics] | - | Computer Acronyms(common) |
| HASP | Harmonically Analyzed Sensitivity Profile | - | Computer Acronyms(common) |
| HASP | Health And Safety Plan | - | Computer Acronyms(common) |
| HASTE | Half-Fourier Acquisition With Single-shot Turbo Spin-echo | - | Computer Acronyms(common) |
| HAT | Histone Acetyltransferase | - | Computer Acronyms(common) |
| HAT | Humid-air Turbine [cycle] | - | Computer Acronyms(common) |
| HATR | Horizontal Attenuated Total Reflection | - | Computer Acronyms(common) |
| HATREMS | Hazardous And Trace Emissions System | - | Computer Acronyms(common) |
| HAUP | High Accuracy Universal Polarimeter | - | Computer Acronyms(common) |
| HAV | Hepatitis A Virus | - | Computer Acronyms(common) |
| HAZ | Heat-affected Zone | - | Computer Acronyms(common) |
| HAZCOM | Hazardous Communication Plan | - | Computer Acronyms(common) |
| HAZMAT | Hazardous Materials | - | Computer Acronyms(common) |
| HAZOP | Hazard And Operability Study | - | Computer Acronyms(common) |
| HAZW | Hazardous Waste Collection Database (accessible Through OLS) | - | Computer Acronyms(common) |
| HAZWOPER | Hazardous Waste Operations And Emergency Response Regulations | - | Computer Acronyms(common) |
| HAZWRAP | Hazardous Waste Remedial Actions Program | - | Computer Acronyms(common) |
| HBAR | High-overtone Bulk Acoustic Resonator | - | Computer Acronyms(common) |
| HBGF | Heparin-binding Growth Factor | - | Computer Acronyms(common) |
| HBJ | Hougen-Bunker-Johns (Hamiltonian For Mol. Calcns.) | - | Computer Acronyms(common) |
| HBL | Health Based Level | - | Computer Acronyms(common) |
| HBN | Hexagonal Boron Nitride | - | Computer Acronyms(common) |
| HBOC | Hemoglobin-Based Oxygen Carrier | - | Computer Acronyms(common) |
| HBOC | Hereditary Breast-ovarian Cancer | - | Computer Acronyms(common) |
| HBSS | Hanks' Balanced Salt Solution | - | Computer Acronyms(common) |
| HBT | Hanbury Brown Twiss (interferometry) | - | Computer Acronyms(common) |
| HBT | Heterojunction Bipolar Transistor | - | Computer Acronyms(common) |
| HBV | Hartree-Bogolyubov-Valatin (theory In Calcn. Of Wave Functions) | - | Computer Acronyms(common) |
| HBV | Hepatitis B Virus | - | Computer Acronyms(common) |
| HBVE | 4-hydroxybutyl Vinyl Etherpar | - | Computer Acronyms(common) |
| HC | Hazardous Constituent | - | Computer Acronyms(common) |
| HCA | Hazardous Communication Act | - | Computer Acronyms(common) |
| HCA | Heterocyclic Amine | - | Computer Acronyms(common) |
| HCA | Hierarchical Cluster Analysis | - | Computer Acronyms(common) |
| HCA | Human Carbonic Anhydrase | - | Computer Acronyms(common) |
| HCC | Hepatocellular Carcinoma | - | Computer Acronyms(common) |
| HCCI | Homogeneous Charge Compression Ignition | - | Computer Acronyms(common) |
| HCCO | Heavy Catalytic Cycle Oil | - | Computer Acronyms(common) |
| HCD | Hollow Cathode Discharge | - | Computer Acronyms(common) |
| HCDW | Hydrogenic Continuum Distorted Wave (a Wave Function In Calcns. On Atomic And Molecular Collisions) | - | Computer Acronyms(common) |
| HCF | High-cycle Fatigue | - | Computer Acronyms(common) |
| HCG | Human Chorionic Gonadotropin | - | Computer Acronyms(common) |
| HCI | Human-Computer Interface | - | Computer Acronyms(common) |
| HCI | Highly Charged Ion | - | Computer Acronyms(common) |
| HCL | Hollow Cathode Lamp | - | Computer Acronyms(common) |
