| ICPSR | |
| IEEE Xplore (1988-) | |
| In the First Person (1930-) | |
| Index of Christian Art | |
| Information Science & Technology Abstracts (1965-) | |
| InfoTrac Newsstand | |
| IngentaConnect (1988-) | |
| Inorganic Crystal Structure Database | |
| Inspec (1969-) | |
| International Bibliography of Art (1990-) | |
| International Bibliography of Theatre & Dance with Full Text (1865-) | |
| International Directory of Company Histories | |
| International Encyclopedia of Communication | |
| International Financial Statistics (1945-) | |
| International Index to Music Periodicals Full Text (1884-) | |
| International Pharmaceutical Abstracts (1970-) | |
| Internet and Personal Computing Abstracts (1980-) | |
| IPA Source | |
| iPOLL Databank | |
| IRIN Annual Report Resource Center | |
| Iter: Gateway to the Middle Ages and Renaissance | |
