| Tammarus, Bishop of Benevento |
| Tarachus, martyred at Anazarbus in Cilicia |
| Tarasius, Greek Martyr |
| Tarasius, Patriarch of Constantinople |
| Tarcisius of Rome, Acolyte and Martyr, Patron of Communion Ministers |
| Tarsilia, Aunt of Gregory the Great |
| Tarsyilya Matskiv, Ukrainian Nun, Martyred by a Soviet Soldier |
| Tatiana of Rome, Deaconess and Martyr |
| Taurinus, Bishop of Auch |
| Telemachus (Almachus), Monk, whose martyrdom ended the gladiatorial games |
| Telesphorus, Pope and Martyr |
| Telmo (Pedro González Telmo), Dominican Priest |
| Terence, Roman Centurion, Martyr |
| Terentius of Imola, Deacon and Hermit |
| Terentius, Bishop of Todi |
| Teresa Casini, Foundress of the Oblate Sisters of the Sacred Heart of Jesus |
| Teresa Cejudo Redondo, laywoman, mother, martyred in Seville |
| Teresa Eustochio Verzeri, Foundress of the Daughters of the Sacred Heart of Jesus |
| Teresa Margarita of the Sacred Heart (Redi), Carmelite nun |
| Teresa of Avila, Carmelite Mystic and Doctor of the Church |
| Teresa of Calcutta (hair, two autographed books) |
| Teresa of Jesus of the Andes, Chilean Carmelite Nun |
| Tertullia, Virgin, Martyr |
| Thais of Egypt, Penitent |
| Thecla of Iconium, Apostolic Virgin and Martyr |
| Themistocles of Myra, Martyr |
| Theobald |
| Theobald (Thibaut, Tybalt) Camoldolese Hermit in Luxembourg |
| Theodard (Audard), Archbishop of Narbonne |
| Theodard, Bishop of Maastricht and Martyr |
| Theodora, Empress of Byzantium, who ended Iconoclasm |
| Theodora of Rome, Virgin and Martyr |
| Theodore Guerin, Foundress of the Sisters of Providence of St. Mary of the Woods |
| Theodore of Byzantium, “the New Martyr” |
| Theodore or Echaita, Soldier and Martyr |
| Theodore Romzha, Ruthenian Bishop of Mukachene, Martyr |
| Theodore the Studite, Abbot in Constantinople, Theologian |
| Theodore, Bishop (of Mopsuestia? or Canterbury?) |
| Theodore, Bishop of Cyrene |
| Theodore, Bishop of Pavia |
| Theodoret of Antioch, Priest, Cathedral Treasurer, Martyred by Julian the Apostate |
| Theodoret, Bishop of Cyrrhus and Theologian |
| Theodosia, Virgin and Martyr |
| Theodosius fhe Great (the Cenobiarch) Abbot |
| Theodosius of Kiev |
| Theodota, martyred at Constantinople for hiding icons |
| Theodulph of Trier, Hermit |
| Theodulph, Bishop of Lobbes, Belgium |
| Theodulus, Martyr |
| Theogenes of Cyzicus, Martyr |
| Theogenes, Bishop of Hippo |
| Theoginis of Laodicia, Martyr |
| Theoktistos of Palestine, Hermit |
| Theonas, Martyr |
| Theonilla, Martyr |
| Theopemptus, Martyr |
| Theophanes the Isaurian, Abbot of Mt Sigriane Abbey, Constantinople |
| Theophila, Martyr |
| Theophilus (Biagio) Arrighi of Corte, Franciscan Priest, Missionary in Corsica |
| Theophilus of Constantinople |
| Theophilus, Sixth Bishop of Antioch, Apologist |
| Theophylact, Metropolitan of Nicomedia |
| Theopompos, Bishop of Nicomedia and Martyr |
| Theotimus, Bishop of Tomi (Constanta), Romania |
| Theotonio, Priest, Augustinian Prior of Coimbra |
| Theresa (Josephine) Dudzik, Foundress of the Franciscan Sisters of Chicago |
| Therese (Marie-Victoire) Couderc, Foundress of the Religious of the Cenacle |
| Therese Martin of Lisieux, Carmelite and Doctor of the Church (Little Flower of the Child Jesus) |
| Therese of St. Augustine: Princess Louise of France, youngest daughter of Louis XV, who was prioress of the Carmelites at St. Denis, poisoned by opponents of the monarchy in 1787 |
| Therese Verhaeghe, 3rd order Dominican, Beguine from Ghent |
| Theresia, Cistercian Nun |
| Thillo (Tillo, Theau), Saxon Priest, Missionary in the Low Countries |
| Thomas a Becket, Archbishop of Canterbury and Martyr |
| Thomas a Kempis (Thomas of Kempen), Canon, Author of the “Imitation of Christ” |
| Thomas ab Urb |
| Thomas Aquinas, Dominican Priest and Doctor of the Church |
| Thomas de Cantalupe, Bishop of Hereford |
| Thomas Garnet, English Jesuit Martyr |
| Thomas More, Chancellor of England and Martyr |
| Thomas of Cori, Franciscan Priest |
| Thomas of Tolentino, Franciscan martyred in China |
| Thomas of Villanova, Augustinian Archbishop of Valencia |
| Thomas the Apostle |
| Thorlak Thorhallsson, Bishop of Skalholt, Patron of Iceland |
| Throphanes “the Recluse” of Antioch |
| Tiburtius. Martyr, Brother-in-law of St. Cecilia |
| Tichon of Limassol, Cyprus, Bishop |
| Tikhon |
| Timon, one of the first Seven Deacons |
| Timothy Giaccardo, Pauline Priest |
| Timothy of Rome, Priest and Martyr |
| Timothy, Bishop of Gaza and Martyr |
| Timothy, Disciple of St. Paul and Bishop of Ephesus |
| Timothy, Martyr |
| Titus Brandsma, Dutch Carmelite Priest, professional journalist, martyred in Dachau |
| Titus, Disciple of St. Paul and Bishop of Crete |
| Tiziano, Fifth Bishop of Brescia |
| Tomasso Bellaci of Florence, butcher, became a Franciscan Brother |
| Tomasso Maria Fusco, Priest, Founder of the Daughters of Charity of the Precious Blood |
| Torello da Poppi, Franciscan Hermit |
| Toribio Romo, Mexican Priest, Martyr, Patron of Immigrants |
| Torpetius (Torpès, Tropez) of Pisa, Martyr |
| Torquatus, Bishop of Gaudix and Martyr |
| Torquatus, Bishop of Saint-Paul-Trois-Chateaux |
| Totnan, companion of St. Kilian, martyred near Würzburg |
| Tranquilinio Ubiarco Robles, Mexican Priest, Cristero Martyr |
| Trianon, Bishop and Martyr |
| Triduana, 8th century Irish Hermitess in Scotland |
| Trifyllius, Bishop of Nicosia |
| Trophima, Martyred in Alexandria |
| Trophimus (Trophime), Bishop of Arles |
| Trudo (Trond) of Hesbaye, Belgium, Benedictine Abbot |
| Tryphenia of Rome, Friend of St. Pauil (greeted in Romans) |
| Tryphon of Campsada, Syria, Martyred in Nicaea |
| Tugdual, Bishop in Brittany |
| Turbon, Martyred in Cappadocia, venerated in Langres |
| Turibius de Mogrovejo, Archbishop of Lima |
| Turibius, Bishop of Astorga |
| Twelve Apostles of Ireland, 6th century monks who studied under St. Finian of Clonard: |
| Brendan of Birr – in B |
| Brendan of Clonfert – in B |
| Canice of Aghaboe – Canice, Irish Abbot of Kilkenny – in C |
| Ciaran of Clonmacnois – in C |
| Ciaran of Saighir – in C |
| Columba of Iona – in C |
| Columba of Terryglass |
| Laisren Mac Nad Froich |
| Mobhi of Glasnevin |
| Ninidh of Lough Erne – in N |
| Ruadhain of Lorrha |
| Senan of Iniscathay – in S |
