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- Gabrielle d'Estrées (1571–1599), Marquise of Monceaux & Duchess of Beaufort & Duchess of Étampes, 1598-1599
- Gentile Brancaleoni (d.1459), Countess of Mercatello sul Metauro, Lady of Massa Trabaria
- Gerberge of Provence (1060–1115), Countess of Provence and Arles, 1093-1115
- Gersende of Bigorre (d.1032/34), Countess of Bigorre
- Gersende of Forcalquier, Countess of Forcalquier, 1209-?
- Gersende of Sabran (1180–1242), Countess of Forcalquier
- Garsende II of Sabran, Lady of Forcalquier
- Gersende of Urgel, Lady of Forcalquier, 1209-?
- Gertrud of Nordheim (1115-1154/65), Countess of Bentheim
- Giordana of Sanseverino, Lady of Solofra
- Giovanna Carafa, Countess of Roddi, 1525–1534
- Gisela Agnes of Rath (1669–1740), Countess of Nienburg, 1694-1740
- Grapella dalle Carceri, Princs of Euboea, 1262-1264
- Guglielma Pallavicini (d.1358), Lady of Thermopylae, Marchioness of Bodonitsa, 1311
- Guillemette of Neufchâtel (1270–1317), also known as Guillemette of Neuenburg, Lady of Montbéliard
- Guillermina, Countess of Pallars-Soubira
- Guinidilda of Roussillon, heiress of Miron I, Count of Roussillon.
- Guinodeon, Countess of Porhoet
- Guirande of Dax, Viscountess of Dax
- Guiscarda of Béarn, Viscountess of Béarn, 1134-1154
- Guyonne of Salins, Lady of Salins
Read more about this topic: List Of Female Rulers And Title Holders