| American Hospitality Academy | Academic & Science |
| Alpha Hydroxyl Acid | Academic & Science |
| Adaptive Hypermedia Architecture | Academic & Science |
| Aim High Academy Inc. | Business |
| American Hardboard Association | Business |
| Alpha Hydroxy Acid | Chemistry |
| Awareness Humor Action | Community |
| Awareness Heightens Achievement | Community |
| Alone, Helpless, and Addicted | Community |
| Anglicans Helping Anglicans | Community |
| American Historical Association | Community |
| Americans Helping Americans | Community |
| Artists Helping Artists | Community |
| Authors Helping Authors | Community |
| A House for Arts | Community |
| Addicts Helping Addicts | Community |
| American Hereford Association | Community |
| Arts, History and Architecture | Community |
| American Heart Association's | Community |
| Art History Architecture | Community |
| American Hippotherapy Association | Community |
| American Humane Association | Community |
| Arts, History, and Adventure | Community |
| Association of Hispanic Arts | Community |
| American Humanist Association | Community |
| Arabian Horse Association | Community |
| American Homebrewers Association | Community |
| Advanced Heuristic Analysis | Computing |
| Accelerated Hub Architecture | Computing |
| Adaptec Host Adapter | Computing |
| Austin Hackers Association | Computing |
| Austin Hackers Anonymous | Computing |
| All Honesty Aside | Computing |
| Art History and Architecture | Educational Degree |
| Academics Highly Achieved | Educational Degree |
| Agricultural Hemp Association | General |
| Activism Hacking Artivism | General |
| Active and Healthy Ageing | General |
| Alpha Hydoxy Acids | General |
| Ayaan Hirsi Ali | General |
| Adaptive Highbeam Assist | General |
| Agile Handling Assist | General |
| August Horch Automobilwerke | General |
| Association of Handcrafted Automobiles | General |
| Automotive Historians Australia | General |
| Audi Hold Assist | General |
| Auto Hold Assist | General |
| Automotive Heritage Awards | General |
| Attitude Harmony and Achievement | General |
| Abolish Human Abortion | General |
| Atty Hanz Abella | General |
| Authentic Hopeful Action | General |
| Alpha Hydroxyl Acids | General |
| Ansi HTML Adapter | General |
| A Hands on Adventure | General |
| Art Happens Anywhere | General |
| Awakening Honesty Action | General |
| Animal Health Act | General |
| Avoid Hasty Abstractions | General |
| Awareness Humility and Action | General |
| Active and Healthy Aging | General |
| Alpha Hydroxy Acids | General |
| Animal Human Alliance | Governmental |
| After Hours Alliance | Governmental |
| American Hospital Association | Healthcare |
| ABHAIPUR | Indian Railway Station |
| Abd Haber Ajansi | International |
| Acta Historiae Artium, Budapesta | International |
| American Heart Association | Medical |
| Ark Health in Action | Medical |
| Australian Healthcare Association | Medical |
| Acquired Haemolytic Anaemia | Medical |
| Anti-Heart Antibody | Medical |
| Anti-Histone Antibody | Medical |
| Associate of The Institute of Hospital Administrators (previously Area Health Authority) | Medical |
| Autoimmune Haemolytic Anaemia | Medical |
| Awesome Heavenly Angel | Messaging |
| Automated Historical Archive | Military and Defence |
| Alert Holding Area | Military and Defence |
| Ammunition Holding Area | Military and Defence |
| Affordable Housing Advocacy | Real Estate |
| Animal Health Australia | Regional |
| Adult Hockey Association | Sports |
