Former Owner
- Girolamo d'Adda1
- Giuliano Attilio Piovano1
- Giulio Antonio Acquaviva1
- Giulio Saibante1
- Giuseppe Antonio Saccardini1
- Giuseppe Canonici1
- Giuseppe Franchini1
- Giusto Venier1
- Gladbach Abbey1
- Gladys Freeman1
- Gotha Research Library1
- Great St. Martin Church1
- Grigorij Sergeevič Stroganov1
- Groenendael Priory1
- Grolier Club1
- Grosvenor, Richard1
- Guilberto Broulin1
- Guilelmus Laing1
- Guillemette Bezard1
- Gundulf1