| H&M | Hennes & Mauritz |
| H&M | Hull & Machinery |
| H1N1 | Hemagglutinin Type 1 and Neuraminidase Type 1 |
| H2O | Water |
| HACCP | Hazard Analysis and Critical Control Point |
| Hadoop | Doug Cutting, Hadoop’s co-creator, named the framework after his child’s stuffed toy elephant. |
| HADP | Hill Area Development Programme |
| HAFED | Haryana State Co-operative Supply and Marketing Federation Limited |
| HAL | Hindustan Aeronautics Limited |
| HAL | Hybrid Assistive Limb |
| HAL | Hardware Abstraction Layer |
| HAL | Halliburton Company |
| HAL | Holland America Line |
| HAL | Hawaiian Airlines |
| HAL | Hypertext Application Language |
| HAL | Hyper Articles en Ligne |
| HAL | Hindustan Antibiotics Limited |
| HAL | Halali Airport |
| HAL | Home Automated Living |
| HAL | Hackers at Large |
| Harley-Davidson | from the name of its founders, William Harley, Arthur Davidson, and Walter Davidson |
| HAXM | Hardware Accelerated Execution Manager |
| Hazmat | Hazardous Materials |
| HBA | Host Bus Adapter |
| HbA1c | Hemoglobin A1c |
| HBD | Happy BirthDay |
| HBD | Hot-Bearing Detector |
| HBD | Habi Airport |
| HBD | Hamburg Blue Devils |
| hBN | Hexagonal Boron Nitride |
| HBO | Home Box Office |
| HBO | Hyperbaric Oxygenation |
| HBO | Hartung–Boothroyd Observatory |
| HBO | Hollywood Bowl Orchestra |
| HBSE | Hazard-Based Safety Engineering |
| HBSE | Haryana Board of School Education |
| HCBS | Home & Community Based Services |
| HCBS | Human Capital Business Solutions |
| HCBS | High Capacity Bus Service |
| HCBS | Hamptons Center for Bariatric Surgery |
| HCL | Hydrogen Chloride |
| HCL | Hindustan Computer Limited |
| HCL | Hairy Cell Leukemia |
| HCL | Hindustan Copper Limited |
| HCL | Hockey Club Lugano |
| HCL | Hennepin County Library |
| HCL | Hales Corners Lutheran Church |
| HCL | Hitachi Cable Limited |
| HCMC | Ho Chi Minh City |
| HCMC | Hellenic Capital Market Commission |
| HCMC | Hennepin County Medical Center |
| HCV | Hepatitis C Virus |
| HCV | Heavy Commercial Vehicle |
| HCV | Higher Calorific Value |
| HCV | Halcyonair |
| HCV | High Conservation Value |
| HCV | Hypersonic Cruise Vehicle |
| HCV | Housing Commission of Victoria |
| HD | High-definition |
| HD-DVD | High Definition/Density Digital Versatile/Video Disc |
| HDCL | Hamilton and District Cricket League |
| HDCP | High-bandwidth Digital Content Protection |
| HDD | Hard Disk Drive |
| HDD | Horizontal Directional Drilling |
| HDF | High Density Fiberboard |
| HDF | Heringsdorf Airport |
| HDF | Hierarchical Data Format |
| HDF | Hadfield |
| HDF | Hereditary Disease Foundation |
| HDF | Hôtel-Dieu de France |
| HDF | Hungarian Defence Forces |
| HDF | Hubble Deep Field |
| HDF | Hydrodefluorination |
| HDF | Human Development Foundation |
| HDFC | Housing Development Finance Corporation |
| HDFC | Housing Development Fund Corporation |
| HDFS | Hadoop Distributed File System |
| HDFS | Human Development and Family Studies |
| HDFS | Harley-Davidson Financial Services |
| HDFS | Hubble Deep Field South |
| HDFS | Humpty Dumpty Falls Scale |
| HDFS | Hellenic Duty Free Shop |
| HDI | Human Development Index |
| HDI | Help Desk Institute |
| HDI | High Density Interconnect |
| HDI | Hexamethylene Diisocyanate |
| HDI | Heidi Device Interface |
| HDI | Humpty Dumpty Institute |
| HDI | Head to Disk Interference |
| HDIL | Housing Development and Infrastructure Limited |
| HDL | High-Density Lipoprotein |
| HDL | Hardware Description Language |
| HDL | Huntington’s Disease-Like |
| HDLC | High-level Data Link Control |
| HDLC | Hamilton District Labour Council |
| HDLC | Historic District Landmarks Commission |
| HDMI | High-Definition Multimedia Interface |
| HDR | High Dynamic Range |
| HDR | High-Dose Rate |
| HDR | Higher Degree Research |
| HDR | Humanitarian Daily Ration |
| HDR | Havadarya Airport |
| HDR | Hot Dry Rocks |
| HDRip | High Definition Rip |
| HDTC | High Definition Telecine |
| HDTC | Humanitarian Demining Training Center |
| HDTC | Homeland Defense Technology Center |
| HDTC | Hornchurch Drum & Trumpet Corps |
| HDTS | High Definition Telesync |
| HDTS | High Desert Test Sites |
| HDTS | Helmet Display and Tracking System |
| HDTS | Home Design Trends Survey |
| HDTS | High Definition Tall Screen |
| HDTS | Holland Destination Travel Service |
| HDTV | High Definition Television |
| He | Helium |
| HE | Higher Education |
| he | Hebrew |
| HE | Hematoxylin and Eosin |
| HE | Hepatic Encephalopathy |
| HE | High-Efficiency |
| HE | His/Her Excellency |
| HE | High Explosives |
| HE | Human Era |
| HE | Hurricane Electric |
| HE | His/Her Eminence |
| HE | Heathrow Express |
| HELP | Higher Education Loan Program |
| HELP | Human Early Learning Partnership |
| HELP | Hydrologic Evaluation of Landfill Performance |
| HELP | Heat Escape Lessening Position |
| HEPA | High Efficiency Particulate Air |
| HEPA | Health-Enhancing Physical Activity |
| HEPA | Higher Education Planning in Asia |
| HEPS | Headline Earnings Per Share |
| HEPS | Hydro-Electric Power Station |
| HEPS | Port Said Airport |
| HEPS | Healthcare systems Ergonomics and Patient Safety Conference |
| HERO | Higher Education and Research Opportunities |
| HERO | Highway Emergency Response Operator |
| HERO | Helicopter Emergency Reconnaissance Observer |
| HESA | Higher Education Statistics Agency |
| HESA | Higher Education South Africa |
| HESA | Higher Education & Student Affairs |
| HESA | Higher Education Support Act 2003 |
| HESAV | Haute Ecole de Santé Vaud |
| HESCO | Hyderabad Electric Supply Company |
| HESCO | Himalayan Environmental Studies And Conservation Organization |
| HF | High Frequency |
| HF | Heart Failure |
| Hf | Hafnium |
| HF | Hartree–Fock |
| HF | Hydrogen Fluoride |
| HF | Helseforetak |
| HF | Holstein Friesian |
| HF | Hands-Free |
| HF | Have Fun |
| HF | High Five |
| HF | Hedge Fund |
| HF | Hotfix |
| HF | HammerFall |
| hf | Hlutafélag |
| HF | Humanity First |
| HF | Heraldo Filipino |
| HF | Hapag-Lloyd Flug |
| HF | Hudobný Fond |
| HF | Helicon Focus |
| HF | Hendrik Frensch |
| HGF | Human Growth Foundation |
| HGF | Hepatocyte Growth Factor |
| HID | High-Intensity Discharge |
| HID | Human Interface Device |
| HID | Hazardous Installations Directorate |
| HIFO | Highest In, First Out |
| Hifo | Institut für Hirnforschung |
| Hindalco | Hindustan Aluminum Corporation |
| HIPAA | Health Insurance Portability and Accountability Act of 1996 |
| HiSET | High School Equivalency Test |
| Hitachi | Hi meaning “sun” and tachi meaning “rise” |
| HITS | Paper Hyperlink-Induced Topic Search |
| HITS | Headend in the Sky |
| HITS | Homicide Investigation Tracking System |
| HIV | Human Immunodeficiency Virus |
| HKEX | Hong Kong Stock Exchange |
| HKG | Hong Kong International Airport |
| HKG | Housekeeping Gene |
| HLA | High Level Assembler |
| HLA | The High Level Architecture |
| HLA | Hydraulic Launch Assist |
| HLA | Human Leukocyte Antigen |
| HLW | High-Level Waste |
| HLW | Herz-Lungen-Wiederbelebung |
| HLW | Haines, Lundberg & Waehler |
| HLW | Hillington West |
| HLW | Hluhluwe Airport |
| HM | Headmaster / Headmistress |
| hm | Hectometre |
| HM | His/Her Majesty |
| HM | Hennes & Mauritz |
| HM | Hidden Machine |
| HM | Hindustan Motors |
| HM | Air Seychelles |
| HM | Hospital Corpsman |
| HM | Heaven’s Metal |
| HM | Hindley-Milner |
| HM | Harvest Moon |
| hm | Heard Island and McDonald Islands (TLD) |
| HM | Hamburg Museum |
| HMMWV | High-Mobility Multipurpose Wheeled Vehicle |
| HMRC | Her Majesty’s Revenue and Customs |
| HMRC | Houston Metropolitan Research Center |
| HMRC | Health Management Research Center |
| HMRC | Human Mobility Research Centre |
| HMT | Hindustan Machine Tools |
| HNIC | Hockey Night in Canada |
| HNIC | Head Nigga In Charge |
| HNIC | Head Nurse in Charge |
| HOD | Head Of Department |
| Honda | from the name of its founder, Soichiro Honda. |
| Honeywell | named after its founder, Mark Honeywell |
| Hotmail | “HoTMaiL” included the letters HTML |
| HP | Hewlett-Packard |
| hp | Horsepower |
| HP | Highway Patrol |
| HP | Hindustan Petroleum |
| HP | Hit Points |
| HP | Helicobacter Pylori |
| HP | America West Airlines |
| HPCL | Hindustan Petroleum Corporation Limited |
| HPCL | Hindustan Paper Corporation Limited |
| HPGCL | Haryana Power Generation Corporation Limited |
| HPLC | High-Performance Liquid Chromatography |
| HPLC | High-Protein, Low-Carbohydrate |
| HPLC | Homeless Persons’ Legal Clinic |
| HPMVL | High Pressure Mercury Vapour Lamp |
| HPTDC | Himachal Pradesh Tourism Development Corporation |
| HPTDC | High Performance Time to Digital Converter |
| HQ | High Quality |
| HQ | Headquarters |
| HR | Human Resources |
| HR | Croatia |
| hr | Hour |
| hr | Horizontal Rule |
| hr | Croatia (TLD) |
| HRA | House Rent Allowance |
| HRA | Health Reimbursement Arrangement |
| HRA | Human Rights Act |
| HRA | Health Risk Assessment |
| HRA | His/Her Royal Highness |
| HRA | Mansehra Airport |
| HRA | Home Runs Allowed |
| HRA | Hereditary Renal Adysplasia |
| HRA | Human Rights Association |
| HRC | Human Rights Campaign |
| HRC | Honda Racing Corporation |
| HRC | High Rupturing Capacity |
| HRC | Hard Rock Cafe |
| HRC | Hillary Rodham Clinton |
| HRC | Hot Rod Circuit |
| HRC | Zhairem Airport |
| HRD | Human Resource Development |
| HRD | Hurricane Research Division |
| href | Hypertext reference |
| HRMS | Human Resource Management System |
| HRMS | High Resolution Microwave Survey |
| HRMS | Harbor Ridge Middle School |
| HRTC | Himachal Road Transport Corporation |
| HRTC | Home Renovation Tax Credit |
| HS | High School |
| Hs | Hassium |
| HSBC | Hong Kong and Shanghai Banking Corporation |
| HSBS | Half Side-by-Side |
| HSC | Higher Secondary Certificate |
| HSC | Health and Safety Commission |
| HSC | Hollow Structural Sections |
| HSC | Harsco Corporation |
| HSCAP | Higher Secondary Centralised Admission Process |
| HSDPA | High Speed Downlink Packet Access |
| HSEB | Higher Secondary Education Board |
| HSEB | Haryana State Electricity Board |
| HSEB | Hydrologic Software Engineering Branch |
| HSIDC | Haryana State Industrial Development Corporation |
| HSIIDC | Haryana State Industrial and Infrastructure Development Corporation |
| HSIL | High-grade Squamous Intraepithelial Lesion |
| HSIL | Hindustan Sanitaryware & Industries Limited |
| HSIL | Henkel Spic India Limited |
| HSL | Hue, Saturation & Lightness |
| HSL | Hindustan Shipyard Limited |
| HSL | Hormone Sensitive Lipase |
| HSL | Huslia Airport |
| HSL | Health and Safety Laboratory |
| HSL | Helsingin Seudun Liikenne |
| HSL | Heeling Sports Limited |
| HSN | Harmonized System Nomenclature |
| HSN | Home Shopping Network |
| HSN | Hereditary Sensory Neuropathy |
| HSN | Health Sciences North |
| HSN | Høgskolen i Sørøst-Norge |
| hsn | Xiang Chinese |
| HSN | Hair, Skin and Nails |
| HSN | Zhoushan Putuoshan Airport |
| HSN | Historical Society of Nigeria |
| HSN | Hasan Abdal |
| HSN | Hispanically Speaking News |
| HSP | Heat Shock Proteins |
| HSP | Host Signal Processing |
| HSP | Hrvatska Stranka Prava |
| HSP | Hereditary Spastic Paraplegia |
| HSP | Henoch-Schonlein Purpura |
| HSP | Hot Soup Processor |
| HSP | Ingalls Field Airport |
| HSP | Hidden Subgroup Problem |
| HSPA | High Speed Packet Access |
| HSRP | Hot Standby Router Protocol |
| HSRP | High Security Registration Plates |
| HSRP | Heart/Stroke Recognition Program |
| HSUPA | High-Speed Uplink Packet Access |
| HSV | Hue, Saturation & Value |
| HSV | Highly Selective Vagotomy |
| HSV | Herpes Simplex Virus |
| HSV | Holden Special Vehicles |
| HSV | Huntsville International Airport |
| HT | Haiti |
| HT | Hyper-Threading |
| HT | High Tension |
| HT | Home Theater |
| HT | Hough Transform |
| HT | Hyperthyroidism |
| ht | Haiti (TLD) |
| htaccess | Hypertext Access |
| HTC | High Tech Computer |
| HTC | Hebrew Theological College |
| HTC | Holy Trinity College |
| HTC | Horry Telephone Cooperative |
| HTC | Highland Theological College |
| HTET | Haryana Teacher’s Eligibility Test |
| HTML | Hypertext Markup Language |
| HTTP | HyperText Transfer Protocol |
| HTTPS | HyperText Transfer Protocol Secure |
| HUDA | Haryana Urban Development Authority |
| HUDCO | Housing and Urban Development Corporation |
| HUF | Hungarian Forint |
| HUF | Terre Haute International Airport |
| HUF | Hindu Undivided Family |
| HUF | Huffy Corporation |
| HUL | Hindustan Unilever Limited |
| HUL | Houlton International Airport |
| HUPA | Housing and Urban Poverty Alleviation |
| HUTT | Head-Up Tilt Test |
| HVAC | Heating, Ventilation and Air Conditioning |
| HVAC | High Voltage Alternating Current |
| HVFCU | Hudson Valley Federal Credit Union |
| HVPNL | Vidyut Prasaran Nigam Limited |
| Hwy | Highway |
| HWY | High Wycombe railway station |
| Hyundai | connotes the sense of “the present age” or “modernity” in Korean |
| HYVS | High Yielding Variety Seeds |
| HZ | Hertz |
