Former Owner
- Robert Walker1
- Robert Wheeler Willson1
- Robert Williams1
- Robert de Hangest5
- Robert de Mol1
- Robson & Kerslake1
- Roderick Terry1
- Roger Martin1
- Rolls1
- Rosamond B. Loring2
- Ross R. DeVean1
- Ross Winans2
- Rowland G. Hazard1
- Rowland Hazard1
- Rowland Oseley1
- Roy G. Fitzgerald1
- Royal Library of Belgium1
- Royal Monastery of Saint Mary of Guadalupe1
- Royaumont Abbey1
- Rudolf Busch2