

| Tailors | Homobonus |
| Tanzania | Immaculate Conception of Mary |
| Taos, New Mexico | Anne, John the Apostle |
| Taranto | Catald |
| Tax collectors | Matthew |
| Taxi Drivers | Fiacre |
| Teachers | Gregory the Great, John Baptist de la Salle |
| Teenagers (esp. girls) | Mark, Maria Goretti |
| Telecommunications | Gabriel the Archangel |
| Television | Clare, Gabriel the Archangel |
| Television (Peru) | Martin de Porres |
| Tennessee, USA | Our Lady of Lourdes |
| Termonde, Belgium | Christiana |
| Teutonic Order; Order of Teutonic Knights | George, Mary |
| Texas, USA | Our Lady of the Annunciation |
| Theatrical profession | Genesius |
| Theft, thieves | Dismas |
| Theologians | Alphonsus de Liguori, Augustine of Hippo, Thomas Aquinas, John the Apostle |
| Theologians, Moral | Alphonsus de Liguori |
| Thieves, danger from | Leonard of Noblac |
| Throat ailments | Blaise, Ludmila |
| Tigua Indians | Anthony of Padua |
| Toledo, Spain | Leocadia |
| Toothache | Apollonia |
| Torino, Italy | John the Baptist |
| Tourism, Spanish | Francis Xavier |
| Trade unionists, Spanish | Martin de Porres |
| Tradespeople | Homobonus |
| Travelers | Raphael the Archangel, Nicholas of Myra, Anthony of Padua, Christopher, Joseph |
| Tregony, Cornwall | Cybi |
| Trier, Germay | Maximus |
| Trieste, Italy | Justus of Trieste |
| Tultepac, Mexico | John of God |
| Tunisia | Immaculate Conception of Mary |
| Turin, Italy | John the Baptist |
| Turkey (Asiatic) | John the Apostle |
| Turkey, Capuchin missions to | Joseph of Leonessa |
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