Encyclopedias, Almanacs, Transcripts, and Maps
- Rhine, J(oseph) B(anks) (1895-1980)
- Rhine, Louisa Ella Weckesser (1891-1983)
- Rhinoceroses: Rhinocerotidae
- Rhizomelic chondrodysplasia punctata
- Rhizomelic Chondrodysplasia Punctata
- Rhombozoans: Rhombozoa
- Ribbon Worms
- Ribbon Worms
- Ribonucleic Acid (RNA)
- Ribonucleic Acid (RNA)
- Rice-Based Diets
- Ricerca Psichica (Journal)
- Richard Adolf Zsigmondy
- Richard Anglicus
- Richard Askey
- Richard Benedict Goldschmidt
- Richard Buckminster Fuller
- Richard Chandler
- Richard Christopher Carrington
- Richard Courant