Encyclopedias, Almanacs, Transcripts, and Maps
- Rogo, David Scott (1950-1990)
- Roland of Parma
- Rolf Herman Nevanlinna
- Roll, William George, Jr. (1926-)
- Rollers
- Rollers
- Rollers: Coraciidae
- Rolling Thunder
- Roman Numerals: Their Origins, Impact, and Limitations
- Roman Roads: Building, Linking, and Defending the Empire
- Ronald Aylmer Fisher
- Ronald Ross
- Roosevelt Spiritual Memorial Benevolent Association
- Root System
- Root System
- Rorquals: Balaenopteridae
- Rosalind Elsie Franklin
- Rosalyn Sussman Yalow
- Rosalyn Sussman Yalow
- Rose Family (Rosaceae)