Encyclopedias, Almanacs, Transcripts, and Maps
- Rose Family (Rosaceae)
- Rose, Ronald K(riss) H(ume) (1920-)
- Rosedale Diet
- Rosemary's Baby
- Rosen, (Samuel) Paul
- Rosetree, Rose
- Rosher, Grace (d. 1980)
- Rosicrucian Anthroposophical League
- Rosicrucian Digest
- Rosicrucian Fellowship
- Rosma, Charles B
- Ross Granville Harrison
- Rotblat, Joseph
- Rothe, Frau Anna (1850-1907)
- Rothmund-Thomson syndrome
- Rothmund-Thomson Syndrome
- Rotifers: Rotifera
- Roughies, Flashlightfishes, and Squirrelfishes: Beryciformes
- Roundworms: Adenophorea
- Rousseau, Jean-Jacques