Encyclopedias, Almanacs, Transcripts, and Maps
- Revival of the Wave Theory of Light in the Early Nineteenth Century
- Revivals
- Revolution and Rotation
- Revue des Études Psychiques
- Revue Métapsychique
- Revue Scientifique et Morale du Spiritisme
- Revue Spirite
- Revue Spiritualiste
- Reye Syndrome
- Reye’s Syndrome
- RFLP (Restriction Fragment Length Polymorphism)
- RH and RH Incompatibility
- Rhabdic Force
- Rhapsodomancy
- Rhasis (or Rhazes) (ca. 825-925)
- Rheas: Rheidae
- Rhesus Monkeys
- Rhesus monkeys
- Rheticus (Georg Joachim von Lauchen)
- Rhetoric of Science and Technology