- Bonus, Petrus, active 1323-1330--Manuscripts1
- Books of hours1
- Booksellers and bookselling1
- Bucolica (Virgil)1
- Burial laws (Jewish law)1
- Burlesques1
- Business mathematics1
- Cabala1
- Cardinals1
- Cardona, Catalina de, 1519-15771
- Carlos, Prince of Viana, 1421-14611
- Caro, Ana1
- Carthusians1
- Cartularies1
- Castilla y León (Spain). Cortes1
- Catholic Church. Diocese of Sigüenza-Guadalajara (Spain)1
- Catiline, approximately 108 B.C.-62 B.C.1
- Censored works1
- Centellas y Confortes, Jaime1
- Centellas, Magdalena de1