K
| Kateri Tekakwitha, First Native American (Mohawk/Algonquin) Saint |
| Katharine Marie Drexel, Foundress of the Sisters of the Blessed Sacrament |
| Katherine Kasper, Foundress of the Poor Handmaids of Jesus Christ |
| Kenny (Cainech, Kenneth) Abbot of Aghaboe, Ireland |
| Kerkyra, Virgin, first woman Martyred in Corfu |
| Kevin of Glendalough, Irish Abbot |
| Keyne (Kenwyn) Welsh Hermitess in Cornwall |
| Kilian, Irish bishop, martyred near Würzburg |
| Kinga, Queen of Poland, Poor Clare |
| Kuksha, Priest, Hieromartyr, Monk of the Great Lavra of the Caves in Kiev |
| Kyra of Berea, Syrian Ascetic Virgin |
L
| Lactantius, Martyr |
| Lacutus |
| Ladislaus (Laszlo), King of Hungary |
| Laetitia (Leticia, Letizia), Virgin and Martyr |
| Laetus (Lié), of Orleans, Hermit |
| Lambert of Zaragoza, Servant, Martyred by his Moorish Master |
| Lambert, Bishop of Lyon |
| Lambert, Bishop of Maastricht, Patron of Liege, Martyr |
| Landelin, Abbot, Founder of Lobbes, Crespin, and Aulne Abbeys |
| Landericus (Landry) Bishop of Meaux |
| Landoald, Lombard Confessor and Bishop, Missionary Companion of St. Remaclus |
| Landrada, Founder and Abbess of Munsterbilzen Abbey |
| Lanfranc, Archbishop of Canterbury |
| Largus, Martyr |
| Laura of Cordoba, Nun, Martyr |
| Laurent Imbert, Bishop of the Paris Foreign Mission Society, Martyred in Korea |
| Lawrence (Lorcan) O’Toole, Archbishop of Dublin |
| Lawrence Giustiniani, Patriarch of Venice |
| Lawrence of Brindisi, Capuchin Priest |
| Lawrence of Rome, Deacon and Martyr |
| Lazarus “Zographos” of Constantinople, Armenian, 1st Iconographer Saint |
| Lazarus of Bethany (said to have become the First Bishop of Marseilles) |
| Lazarus of Magnesia, Stylite |
| Lazarus, Bishop of Milan |
| Lea of Rome, Abbess |
| Leander, Bishop of Seville |
| Lebwin (Leofwine), Anglo-Saxon Missionary to Frisia, Patron of Deventer |
| Leo I (the Great), Pope and Father of the Church |
| Leo II, Bishop of Catania, Confessor |
| Leo II, Pope |
| Leo III, Pope |
| Leo IX, Pope |
| Leo of Lycia, Martyr |
| Leo XIII, Pope |
| Leo, Martyr |
| Leobonus of Salagnac, Hermit |
| Leocadia, Virgin and Martyr |
| Leocritia, Virgin, Martyr of Cordoba |
| Leodegarius (Leger), Bishop of Autun and Martyr |
| Leodewin (Ludwin), Bishop of Trier |
| Leonard Kimura, Jesuit Lay Brother, one of the Martyrs of Nagasaki |
| Leonard Lessius, Flemish Jesuit moral theologian |
| Leonard Murialdo, Priest, Founder of the Society of St. Joseph |
| Leonard of Port Maurice, Franciscan |
| Leonard of Reresby, Yorkshire, Confessor |
| Leonardo Perez Larios, Mexican Layman, Cristero Martyr |
| Leonidas of Alexandria, Father of Origen, Martyr |
| Leonilla, Martyred in Cappadocia, Venerated at Langres |
| Leonora, Queen of England |
| Leontia, Virgin and Martyr |
| Leontius of Rome, Martyr |
| Leontius of Tripoli, Greek General in the Roman Army, Martyr |
| Leontius, Bishop of Caesarea in Cappadocia |
| Leontius, Bishop of Rostov |
| Leopardus, First Bishop of Osimo |
| Leopold IV, Margrave of Austria |
| Leopold of Caiche, Capuchin Priest |
| Leopoldo (Bogdan) Mandić, Croatian Capuchin Priest, died in Padua |
| Leotehardus, Bishop of Auch |
| Leovigildo, Martyr of Cordoba |
| Leto, Martyr |
| Leucius, First Bishop of Brindisi (lead seal, made between 1000 and 1200) |
| Leudinus, Bishop of Toul |
| Liberata, Virgin and Martyr |
| Liberatus, Abbot martyred at Carthage |
| Liberius III, Bishop of Ravenna |
| Liberius, Bishop of Poitiers |
| Liborius, Bishop of Le Mans |
| Liduina (Elisa Angela) Meneguzzi, Salesian Sister, missionary to Ethiopia |
| Linus, Pope and Martyr |
| Lioba (Leobgitha), English Abbess and Missionary, Kinswoman of St. Boniface |
| Litifredus, Bishop of Pavia |
| Litorius (Lothar) of Tours |
| Liudwinus, Bishop of Trier |
| Livinus (Lebwin), Apostle of Flanders, Bishop of Ghent, Martyr |
| Lochininia of Rossory, Ireland |
| Longinus, Centurion at the Crucifixion and Martyr |
| Lorenzo Majoranus di Siponto, Bishop of Siponto |
| Lorenzo of Novara, Priest, Martyr |
| Lorenzo Ruiz, Martyr, First Filipino Saint |
| Lorenzo Salvi, Passionist Priest |
| Lothar, Bishop of Séez |
| Louis (Luis) Bertrand, Dominican Priest, Missionary to South America |
| Louis Aleman, Cardinal Archbishop of Arles |
| Louis IX, King of France |
| Louis Marie Grignon de Montfort, Founder of the Missionaries of the Company of Mary |
| Louis Martin, Father of St. Therese of Lisieux |
| Louis of Anjou, Franciscan Bishop of Toulouse |
| Louis Querbes, Priest, Founder of the Clerics of St. Viator, the Viatorians |
| Louis XVI, King of France (from his hair) |
| Louise de Marillac, Foundress of the Daughters of Charity |
| Louis-Zepherin Moreau, Bishop of Saint-Hyacinthe, Founder of the Sisters of St. Martha and St. Joseph |
| Loup (Lupus = Wolf), Bishop of Troyes |
| Luanus, Lua, Lugil, Molua, Abbot of Killaloe, Ireland |
| Lubentius of Kobern, Archbishop of Hamburg-Bremen |
| Lubin (Leobinus), Bishop of Chartres |
| Luca Belludi, Franciscan, Disciple of Anthony of Padua |
| Lucas the Younger, Stylite from Chalcedon |
| Lucia de Jesus Rosa dos Santos, Sr. Lucia, who saw Our Lady of Fatima |
| Lucian of Antioch, Priest and Martyr |
| Lucianus (Lucien), Bishop of Beauvais, Martyr |
| Lucidus, Italian Benedictine Monk |
| Lucien, First Bishop of Beauvais, Martyr |
| Lucina, Roman Matron |
| Lucius (Luchesio) Modestini, Franciscan |
| Lucius I, Pope and Martyr |
| Lucius of Cyrene, Prophet in the Apostolic Church in Antioch |
| Lucy Brocadelli of Narni, Dominican Mystic and Stigmatic |
| Lucy, Virgin and Martyr |
| Ludan, Irish Pilgrim, Confessor |
| Ludger, 1st Bishop of Münster |
| Ludmila, Duchess of Bohemia, Martyr, Grandmother of St. Wenceslaus |
| Ludolf, Norbertine Bishop of Ratzeburg, Martyr |
| Ludovic Frarrijn (Luis Flores) Flemish Dominican Priest, Martyr of Nagasaki |
| Ludovica (Louise) Albertoni, Widow, Franciscan |
| Lugilianus, British pilgrim, murdered in France |
| Luigi Orione, Priest, Founder of the Sons of Divine Providence |
| Luigi Versiglia, Salesian Missionary Bishop in China |
| Luis Batiz Sainz, Priest, Cristero Martyr |
| Luis Magana Servin, Mexican Layman, Cristero Martyr |
| Luke Kirby, English Priest and Martyr |
| Luke the Evangelist |
| Lull, Archbishop of Herzfeld |
| Lupus, Bishop of Sens |
| Lutgardis, Cistercian mystic |
| Luxorius, Soldier, Martyred in Sardinia |
| Lydia of Thyatira, Disciple of St. Paul at Philippi |