| Groupon | business, public company | Chicago | 2008 |
| Grubhub | food delivery, online service, business, subsidiary company, enterprise | Chicago | 2004 |
| GTE | business, enterprise | Stamford | 1918 |
| Guardian Industries | business | Auburn Hills | 1932 |
| Guild Guitar Company | business, factory | Oxnard | 1952 |
| H Mart | supermarket chain | Lyndhurst | 1982 |
| Hachette Book Group | book publisher, publishing house | New York City | 1837 |
| Hallmark Cards | privately held company, publishing house, business, gift shop retail chain | Kansas City | 1907 |
| Hamburger University | corporate university | — | 1961 |
| Hamilton College | private not-for-profit educational institution, liberal arts college in the United States | — | 1793 |
| Hamline University | private not-for-profit educational institution, private university | — | 1854 |
| Hampshire College | liberal arts college, Colleges That Change Lives, private not-for-profit educational institution | — | 1965 |
| Handspring | business | Mountain View | June 1998 |
| Hanesbrands | business, public company | Winston-Salem | January 1, 2000 |
| Hangar 13 | video game developer | Novato | December 4, 2014 |
| Hanna-Barbera | animation studio, business | Los Angeles, Sherman Oaks Galleria | 1957 |
| Happy Madison Productions | television production company, film production company | Manchester, Los Angeles | December 10, 1999 |
| Harcourt | publishing house | San Diego, New York City | 1919 |
| Hardee's | business | St. Louis | September 9, 1960 |
| Harley-Davidson | motorcycle manufacturer | Milwaukee | 1903 |
| Harman International Industries | business, enterprise, public company | Stamford | 1980 |
| Harman Kardon | brand, business, enterprise | Stamford | 1953 |
| Harmonix Music Systems | video game developer | Cambridge | 1995 |
| Harry S. Truman Presidential Library and Museum | museum, library | — | 1957 |
| Harvard Medical School | medical school | — | 1782 |
| Hasbro | board game publishing company, business, enterprise, public company | Pawtucket | 1923 |
| Haskell Indian Nations University | American Indian boarding school, public educational institution of the United States, university, land-grant university, tribal colleges and universities | — | 1884 |
| HathiTrust Digital Library | bibliographic index, digital library, website, library | Michigan | 2008 |
| Hawaiian Airlines | airline, public company | Honolulu | January 30, 1929 |
| HBO | film production company, subscription television channel | New York City | November 8, 1972 |
| HEAD | business, enterprise | Kennelbach | 1950 |
| Head & Shoulders | brand, public company | — | November 1946 |
| Heart Attack Grill | fast-food hamburger restaurant | Las Vegas | 2005 |
| Hebrew Union College – Jewish Institute of Religion – Cincinnati | private not-for-profit educational institution, seminary | — | 1875 |
| Hennessey Performance Engineering | business, automobile manufacturer | Houston | 1992 |
| Henry Ford Company | business, automobile manufacturer | Detroit | 1901 |
| Herbalife | multi-level marketing company, public company | Cayman Islands, Los Angeles, California | February 1980 |
| Hercules Inc. | business | Wilmington | 1912 |
| Heroku | business | San Francisco, California | 2007 |
| HGST | business, enterprise | San Jose | 2003 |
| High Impact Games | video game developer | Burbank | 2003 |
| High Moon Studios | video game developer | San Diego | 2001 |
| Hill & Knowlton | public relations agency, business, enterprise | New York City | 1927 |
| Hiller Aircraft Company | business | Firebaugh | 1942 |
| Hilton Hawaiian Village | hotel | — | 1957 |
| Hilton Hotels & Resorts | hotel chain, organization | Texas | 1919 |
| Hilton Worldwide | multinational corporation, hotel chain, public company | McLean | 1919 |
| Hofstra University | private not-for-profit educational institution, private university | — | 1935 |