

| Dairy workers | Bridgid of Ireland |
| Dalmatia | Blaise |
| Dancers | Vitus |
| Deacons | Stephen |
| Deaf | Francis de Sales |
| Death | Michael the Archangel, Margaret (or Marina) of Antioch |
| Death, happy | Joseph of Cupertino |
| Death, sudden | Andrew Avellino |
| Degree candidates | Joseph of Cupertino |
| Delaware, USA | Our Lady of Mercy |
| Denmark | Anskar |
| Dentists | Apollonia |
| Desperate situations | Jude, Gregory the Wonderworker, Rita of Cascia, Eustace |
| Detraction | John Nepomucene |
| Diabolical possession | Cyriacus, Dymphna |
| Difficult situations | Eustace |
| Digne, France | Vincent of Digne |
| Dijon | Benignus of Dijon, Urban of Langres |
| Diocesan priests | John of Avila |
| Diplomatic services | Gabriel the Archangel |
| Disabled | Giles |
| Disasters | Genevieve (Genofeva) |
| Diseases of the eye | Raphael the Archangel, Lucy |
| Diseases, contagious | Roch, Sebastian |
| Diseases, nervous | Dymphna |
| Doctors | Luke, Cosmas and Damian, Pantaleon |
| Domestic animals | Antony the Abbot, Gerlac of Valkenburg |
| Domestic workers | Zita |
| Dominican Republic | Our Lady of Mercy |
| Doubters | Joseph |
| Draguignan, France | Rosalina of Villeneuve |
| Drought | Genevieve (Genofeva) |
| Drought relief | Herbert, Godeberta, Solange |
| Drowning, death or danger from | Adjutor |
| Druggists (pharmacists) | Cosmas and Damian |
| Dubrovnik | Blaise |
| Durham, England | Cuthbert |
| Dyers | Maurice |
| Dying | Joseph, Benedict, Abbot, James the Lesser, Apostle, Lebuin (Liafwine), Maximus, Nicholas of Tolentino |
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