Parentless Concepts
- report
- region free
- Reichel, Servatius
- Reihen, Conradus
- Remus Quietanus, Johannes
- Remus, Georg
- Remy, Nicolas
- Represented object
- Requesens, Alfons de
- resource
- Ressler, Martin
- restricted access
- Reusner, Adam
- review
- Rhait, Gaspar
- Rhine
- Rhitzsch, Paulus Raphael
- Ribelius, Theodosius
- Riccardi, Vincenzo
- Richard Knolles, The generall historie of the Turkes
- Rigault, Nicolas
- Rihel