Former Owner
- Robert Brodhead Honeyman1
- Robert Davies1
- Robert Elyot1
- Robert Garrett3
- Robert Hoe III5
- Robert de Hangest5
- Roger Martin1
- Ross Winans1
- Rowland Hazard1
- Rowland Oseley1
- Roy G. Fitzgerald1
- Ruth Fowler Jarvis1
- S. Ereilter1
- S. S. Conant1
- Saint Joseph's Seminary1
- Saint-Riquier1
- Sam Fogg Rare Books & Manuscripts2
- Samuel Addington1
- Samuel Putnam Avery1
- Samuel Wix1