- Gabriel Archangel
- Gabriel Lallemant (one of the Holy North American Martyrs
- Gabriel of Our Lady of Sorrows, Passionist
- Gal, Bishop of Clermont
- Gall, Abbot
- Gatian, First Bishop of Tours
- Gemma Galgani, Virgin
- Genevieve, Virgin
- Geoffroy or Godfrey, Bishop of Amiens
- George, Martyr, Patron of Soldiers
- Gerard Majella, Redemptorist Coadjutor Brother
- Gerardino Sostegni, one of the Seven Holy Servite Founders
- Germaine Cousin, Virgin
- Germanus, Bishop of Auxerre
- Germanus, Bishop of Paris
- Gertrude, Abbess of Eisleben
- Giles, Abbot
- Goar, Priest and Hermit
- Godfrey or Geoffroy, Bishop of Amiens
- Good Counsel, (Our Lady of Good Counsel)
- Gregory the Great, Pope, Doctor of the Church
- Gregory VII, Pope
- Gregory Nazianzen, Archbishop of Constantinople, Doctor of the Church
- Gregory Thaumaturge, Bishop, confessor
- Guadalupe (Our Lady of...), Patroness of Latin America
- Guardian Angels
- Guy of Anderlecht, Hermit and Pilgrim
- Guy (or Vitus), Modestus, and Crescentia, Martyrs
