Former Owner
- Robert S. Pirie1
- Robert Villareal1
- Robert Wheeler Willson1
- Robert de Mol1
- Robson & Kerslake1
- Roderick Terry1
- Roger Martin1
- Rolls1
- Rosamond B. Loring1
- Ross R. DeVean1
- Rowland G. Hazard1
- Rowland Hazard1
- Rowland Oseley1
- Roy G. Fitzgerald1
- Royal Library of Belgium1
- Royal Monastery of Saint Mary of Guadalupe1
- Royaumont Abbey1
- Rudolf Graupner1
- Rudolf Hofmeister1
- Rudolph B. Gottfried1