Former Owner
- Biblioteca Bottigella1
- Biblioteca Trivulziana1
- Bill McGrath1
- Bill Ward1
- Birgittinessenklooster Mariënwater1
- Bonhams & Butterfield1
- Breslauer and Meyer1
- Bridgewater Library1
- Brinton, Daniel G. 1837-18991
- Byron Reed1
- Būtū ʻAbd al-Bāqī1
- Carlo Morbio1
- Carlos José Gutiérrez de los Ríos y Rohan Chabot Fernán-Núñez1
- Castel-Lodève family1
- Catherine de' Medici1
- Charles Edward Harris-St. John1
- Charles Eliot Norton1
- Charles Golding1
- Charles Hoff1
- Charles Lenormand du Coudray1