- Gregory I, Pope, approximately 540-6041
- Gucciarelli, Buongiuliano de1
- Guelfi, Martino1
- Guelfo, Martino di1
- Guerre de Jugurtha, 111-105 av. J.-C--Ouvrages avant 18001
- Guidalotti, Antonia1
- Guido, Jacopo di1
- Guido, Pietro di1
- Guidoni, Luigi1
- Gurrea Pelliparinus, Johannes de1
- Guy of Warwick (Legendary character)--Romances1
- Hadith--Texts1
- Hagiography1
- Henry IV, King of Castile and Leon, 1425-14741
- Heraldry1
- Hilarion, Saint, approximately 291-approximately 3711
- Historia de regibus Gothorum, Vandalorum, et Suevorum (Isidore, of Seville, Saint)1
- Historiography1
- History of Biblical events1
- History, Military1