| RDS business & industry (Latest 2 years) | |
| RDS tablebase (1992-) | |
| Readers' Guide Full Text Mega (1983-) | |
| Readers' Guide Retrospective: (1890-1982) | |
| Reaxys (1772-) | |
| Reference Manual for Telecommunications Engineering | |
| ReferenceUSA | |
| RefWorks | |
| Regional Business News (1984-) | |
| Religion & Philosophy Collection (1911-) | |
| RIBA British Architectural Library (1984-) | |
| RILM Abstracts of Music Literature | |
| RIPM, Retrospective Index to Music Periodicals (1800-1950) | |
| RISM Series A/II, Music Manuscripts after 1600 (1600-) | |
| Roper Center Public Opinion Archives | |
| Rotunda - The Dolley Madison Digital Edition | |
| Rotunda - The Papers of George Washington | |
