| Handbook of chemistry and physics | |
| Handbook of Latin American Studies (1997-) | |
| Handbook of Texas Online | |
| HAPI Online (1970-) | |
| Hartford Courant (1764-1986) | |
| Hathi Trust Digital Library | |
| Health & Wellness Resource Center (1987-) | |
| Health and Psychosocial Instruments (1935-) | |
| Health Reference Center Academic (1996-) | |
| Health Source, Nursing/Academic Edition (1953-) | |
| HeritageQuest Online (1790-) | |
| Hispanic American Newspapers (1808-1980) | |
| Historical Abstracts (1955-) | |
| Historical Annual Reports (1884-) | |
| Historical newspapers (1889-1994) | |
| Historical Newspapers Databases (ProQuest Only) | |
| Historical Statistics of the United States (1520-2000) | |
| Historical Wall Street Journal (1889-1994) | |
| History Databases (ProQuest Only) | |
| Hoover's | |
| Horizon | |
| Hospitality & Tourism Complete (1965-) | |
| House of Commons Parliamentary Papers (1866-) | |
| Humanities & Social Sciences Index Retrospective: (1907-1984) | |
| Humanities International Complete (1975-) | |
