Former Owner
- Robert Garrett3
- Robert H. Sayre1
- Robert Hoe III28
- Robert Lehman1
- Robert de Hangest2
- Roderick Terry1
- Ross Winans1
- Royaumont Abbey1
- Rudolph Frederick Kelker1
- Rushton Mather Dorman1
- Sabin1
- Saint Mihiel Abbey1
- Saint-Amand Abbey1
- Saint-Riquier1
- Samuel Claggett Chew2
- Samuel Lee1
- Samuel Putnam Avery1
- Sandbergs Bokhandel1
- Sebastienne Boscher1
- Simon Gratz1