Author
- Geoffrey Chaucer1
- Geoffrey of Vinsauf1
- Georg Hayniger1
- Georg von Peuerbach1
- Gerard Zerbolt of Zutphen1
- Gerardo da Siena1
- Ghazzī, Aḥmad ibn ʻAbd Allāh, d. 14191
- Giacomo Giroldi1
- Giles of Rome1
- Giovanni Francesco Russo1
- Giovanni Ravizi1
- Giovanni d'Andrea1
- Guido de Monte Rochen1
- Guido delle Colonne1
- Guillaume Tardif1
- Hamdallah Mustawfi1
- Haymo of Faversham1
- Heinrich Reicher1
- Heinrich Stegmüller1
- Henricus de Ratisbona1