| HSA | Haiku Society of America 
| Others |
| HSA | Hampshire Special Ale
| Others |
| HSA | Handicap Scuba Association
| Others |
| HSA | Handicapped Scuba Association
| Others |
| HSA | Hardware System Area
| Others |
| HSA | Harlem School of the Arts
| Others |
| HSA | Harrisons Spy Agency
| Others |
| HSA | Harvard Student Agencies
| Others |
| HSA | Hawaii State Assessment
| Others |
| HSA | Head Side Airbag
| Others |
| HSA | Health and Safety Authority
| Others |
| HSA | Health Saving Account
| Others |
| HSA | Health Savings Account
| Others |
| HSA | Health Savings Accounts
| Others |
| HSA | Health Savings Administrators
| Others |
| HSA | Health Sciences Authority
| Others |
| HSA | Health Service Area
| Others |
| HSA | Health Services Administration
| Others |
| HSA | Health Spending Account
| Others |
| HSA | Heart-Sized Ashes
| Others |
| HSA | Heath Savings Account
| Others |
| HSA | Hegel Society of America
| Others |
| HSA | Hermosillo Stamping and Assembly
| Others |
| HSA | Herrler Schwarzer Automobile
| Others |
| HSA | Heterogeneous System Architecture
| Others |
| HSA | Hidden Savings Awesome
| Others |
| HSA | High School Assessment
| Others |
| HSA | High School Assessments
| Others |
| HSA | High Solids Acrylic
| Others |
| HSA | High Speed Access
| Others |
| HSA | High Speed Data Acquisition
| Others |
| HSA | High System Availability
| Others |
| HSA | Highest Station Address
| Others |
| HSA | Highway Safety Act
| Others |
| HSA | Highway Safety Assessments
| Others |
| HSA | Hill Start Aid
| Others |
| HSA | Hill Start Assist
| Others |
| HSA | Hillclimb and Sprint Association
| Others |
| HSA | Hindu Succession Act
| Judiciary, Legal, Policy, Property |
| HSA | Hino South Africa
| Others |
| HSA | Hispano Suiza Automobilmanufaktur
| Others |
| HSA | Hmong Student A
| Others |
| HSA | Hmong Student Association
| Others |
| HSA | Holistic Student Assessment
| Others |
| HSA | Holt Software Associates
| Others |
| HSA | Home School Association
| Others |
| HSA | Home Security of America, Inc.
| Others |
| HSA | Home Sewing Association
| Others |
| HSA | Honda South Africa
| Others |
| HSA | Hong Seng Assembly
| Others |
| HSA | Horse Serum Albumin
| Others |
| HSA | Horsemanship Safety Association
| Others |
| HSA | Hospital Service Area
| Others |
| HSA | Hospital Spending Allowance
| Others |
| HSA | Hot Sex Action
| Others |
| HSA | Hot Spot Avoiding
| Others |
| HSA | Hotspot Site Appliance
| Others |
| HSA | Human Serum Albumin
| Others |
| HSA | Human Services Agency
| Others |
| HSA | Humane Slaughter Association
| Others |
| HSA | Hunt Saboteurs Association
| Others |
| HSA | Huntsville Swim Association
| Others |
| HSA | Hydraulic Shock Absorber
| Others |