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- Saint Lactan, born near Cork in Ireland, St Comgall entrusted him to found a monastery at Achadh-Ur, now Freshford, in Kilkenny (672) West, before the Schism 19 March
- Saint Laetus, a monk at the age of twelve, he is honoured near Orleans in France, his relics enshrined in the village of Saint-Lyé-la-Forêt (533) West, before the Schism 5 November
- Saint Lalluwy, Virgin West, before the Schism 6 October
- Saint Lamalisse (Molaise of Leighlin), a hermit in Scotland, he left his name to the islet of Lamlash off the coast of the Isle of Arran in Scotland (7th century) West, before the Schism 3 March
- Saints Lambert and Valerius (Bellère, Beriher), disciples of St Gislenus in Belgium and the north of France (c. 680) West, before the Schism 9 October
- Saint Lambert of Lyon, Abbot of Fontenelle and Bishop of Lyon (688) West, before the Schism 14 April
- Hieromartyr Lambert of Maastricht, Bishop of Maastricht (704) West, before the Schism 17 September
- Saint Lambert of Saragossa, a servant who was martyred near Saragossa by his Saracen master (c. 900) West, before the Schism 16 April
- Venerable Lampadus, monk, of Irenopolis (10th century) 5 July
- New Martyr Lampros of Makri, Alexandroupoli, in Thrace (1835) 2 July
- Saint Landelinus, former brigand who underwent a Christian conversion and became a monastic founder (c. 686) West, before the Schism 15 June
- Saint Landericus (Landry of Metz), Bishop of Meaux, then Abbot of Soignies (7th century) West, before the Schism 17 April
- Saint Landericus (Landry), a monk at Novalese Abbey in Savoy in Italy, drowned in the River Arc by evildoers (c. 1050) West, before the Schism 10 June
- Saint Landericus of Paris (Landry of Paris), Bishop of Paris in France (661) West, before the Schism 10 June
- Saints Landoald and Amantius, a priest and deacon who helped enlighten what is now Belgium and north-eastern France, founded the church at Wintershoven (c. 668) West, before the Schism 19 March
- Saint Landrada of Austrasia, foundress and first Abbess of Munsterbilsen in Belgium (c. 690) West, before the Schism 8 July
- Saints Lantfrid, Waltram and Elilantus, three brothers who founded the Monastery of Benediktbeuren in Bavaria, Germany and succeeded one another as abbots (c. 770) West, before the Schism 10 July
- Martyr Laodicius, jailer of Saint Glyceria (c. 138-161) 13 May
- Saint Lasar (Lassar, Lassera), a nun in Ireland and niece of St Forchera (6th century) West, before the Schism 29 March
- Saint Laserian (Molaisse), founder of the monastery and bishopric of Leighlin in Ireland (639) West, before the Schism 18 April
- Saint Laud of Coutances (Lauto, Laudus, Lô), Bishop of Coutances in France for forty years (528-568) West, before the Schism 22 September
- Saint Laumer (Lomer, Laudomarus), Abbot of Corbion Monastery (593) West, before the Schism 19 January
- Saint Laura of Cordoba, a nun at Santa María de Cuteclara de Córdoba, martyred by the Moors by being thrown into a cauldron of molten lead (864) West, before the Schism 19 October
- Venerable Laurence (Lavrentios of Megara), founder of the monastery of the Mother of God Phaneromeni on Salamis Island (1707) 7 March
- Saint Laurence of Canterbury, the second Archbishop of Canterbury (619) West, before the Schism 2 February, 3 February
- Saint Laurence of Egypt, monk, of Egypt (6th century) 10 May
- Blessed Laurence of Kaluga, Fool-for-Christ (1515) 10 August
- Saint Laurence of Siponto, called Majoranus, Bishop of Siponto in Italy, who built the church of St Michael on Mt. Gargano (c. 546) West, before the Schism 7 February
- Saint Laurence the Illuminator (Lawrence of Spoleto), Bishop of Spoleto, then founder of Farfa Abbey (576) West, before the Schism 3 February
- Venerable Laurence the Recluse of the Kiev Caves (13th-14th century) 20 January
- Saint Laurence the Wonderworker of Chernigov Convent (1950) 6 January
- Hieromartyr Laurence, at Novara, and some boys whom he was teaching (397) West, before the Schism 30 April
- Venerable Laurence, monastic founder at Mt. Pelion in Volos (late 14th century) 10 May
- Venerable Laurence, recluse of the Kiev Caves and Bishop of Turov (1194) 29 January
- Martyrs Laurentinus, Ignatius and Celerina, martyrs in North Africa (3rd century) West, before the Schism 3 February
- Saint Laurianus, Archbishop of Seville in Spain, he was martyred in Bourges in France (c. 544) West, before the Schism 4 July
- Saint Laurus (Lery), born in Wales, he went to Brittany and founded the monastery later called after him, Saint-Léry, on the River Doneff (7th century) West, before the Schism 30 September
- Saint Lawdog (6th century) West, before the Schism 21 January
- New Hieromartyr Lawrence (Knyazev), Bishop of Balakhnin, and Alexis Porfiriev, Archpriest, and with them New Martyr Alexis Neidhardt (1918) 24 October
- Venerable Lawrence (Laurence) of Chernigov (1950) 29 December
- New Hieromartyr Lawrence (Levchenko), Hieromonk, of Optina Monastery (1937) 12 October
- Venerable Lawrence the Martyr (Lavrentios), one of the "300 Allemagne Saints" in Cyprus (12th century) 12 March
- Martyr Lawrence, martyred in the arena, by the pagans 9 January
- Venerable Saints Lazarus (1391) and Athanasius (15th century), monks of Murman Island, Onega Lake, Republic of Karelia 8 March
- New Martyr Lazarus of Bulgaria, who suffered at Pergamus (1802) 23 April
- Saint Lazarus of Milan, Archbishop of Milan, he defended his flock from the Ostrogoths West, before the Schism 11 February
- New Hieromartyr Lazarus of the Peloponnese (c. 1618) 23 February
- Venerable Lazarus the iconographer of Constantinople (857) 17 November
- Saint Lazarus the Righteous (Lazarus the Just), the friend of Christ (1st century) 17 March
- Venerable Lazarus the Wonderworker, of Mt. Galesion, near Ephesus (1054) 7 November
- Saint Lea of Rome, an aristocrat in Rome who on the death of her husband entered the convent of St Marcella (384) West, before the Schism 22 March
- Martyr Leander of Epirus 2 June
- Saint Leander of Seville, Archbishop of Seville (600) West, before the Schism 27 February
- Saint Leander of Seville, Bishop of Seville (596) West, before the Schism 13 March
- Saint Lebuinus (Liafwine, Leafwine), Apostle of the Frisians and patron of Deventer (c. 773) West, before the Schism 12 November
- Saint Lelia, a holy virgin connected with Limerick and Kerry; several places in Ireland are named after her West, before the Schism 11 August
- Venerable Leo (Leonidus) the Archimandrite 30 December
- New Hieromartyr Leo (Yegorov), Archimandrite, of the St. Alexander Nevsky Lavra (1937) 7 September
- Martyrs Leo and Parigorius of Patara in Lycia (c. 258) 18 February
- Saint Leo I, Eastern Roman Emperor and Confessor (474) 20 January
- Saint Leo II, Pope of Rome (683) West, before the Schism 3 July
- Saint Leo III, Pope of Rome, who refused to add the filioque to the Nicene Creed (816) West, before the Schism 12 June
- New Hieromartyr Leo Korobczuk, Priest of Laskov (Chełm and Podlasie, Poland) (1944) 25 February
- Saint Leo of Cappadocia, monastic 29 February
- Saint Leo of Catania (Leo the Wonderworker), Bishop of Catania in Sicily (785) 20 February
- Saint Leo of Nonantula, monk and abbot of Nonantola Abbey near Modena in Italy (1000) West, before the Schism 20 November
- Saint Leo of Samos (Leontos), Bishop of Samos, Wonderworker (9th century) 26 April
- Saint Leo of Sens, Bishop of Sens in France for twenty-three years (541) West, before the Schism 22 April
- Saint Leo of Troyes (Saint-Lyé), monk who succeeded St Romanus as Abbot of Mantenay near Troyes, France (c. 550) West, before the Schism 25 May
- Saint Leo the Great, Pope of Rome (461) 18 February
- Saint Leo the Great, Pope of Rome, Confessor (461) West, before the Schism 10 November
- Saint Leo the Hermit, Ascetic 1 July
- Hieromartyr Leo, Bishop and Martyr, perhaps under the Arians, in the Agro Verano in Italy West, before the Schism 14 March
- Martyrs Leo, Donatus, Abundantius, Nicephorus, and nine others - a group of thirteen martyrs who laid down their lives for Christ in North Africa West, before the Schism 1 March
- Martyr Leo, drowned off the coast of Myra in Lycia 18 August
- Venerable Leo, monk, of Mandra (of the Sheepfold) 11 July
- Saint Leobald (Leodebod, Leodebaldus), founder of Fleury Abbey, later called Saint-Benoît-sur-Loire, near Orleans in France (650) West, before the Schism 8 August
- Saint Leobardus the Recluse of Marmoutier, Gaul (593) West, before the Schism 18 January
- Saint Leobinus (Lubin), Abbot of Brou, then Bishop of Chartres (c. 556) West, before the Schism 15 September
- Virgin Martyr Leocadia (Locaie) of Toledo, Spain (c. 303) West, before the Schism 9 December
- Saint Leocritia (Lucretia), a holy virgin in Cordoba in Spain (859) West, before the Schism 15 March
- Hieromartyr Leodegarius (Leger), Bishop of Autun, imprisoned, blinded and finally murdered by the tyrant Ebroin (679) West, before the Schism 2 October
- Saint Leonard of Avranches, Bishop of Avranches (ca. 614) West, before the Schism 4 March
- Saint Leonard of Noblac, Gaul (c. 559) West, before the Schism 6 November
- Saint Leonard of Vandœuvre, a hermit who founded Vandoeuvre, now Saint-Léonard-des-Bois, near Le Mans in France (c. 570) West, before the Schism 15 October
- Saint Leonianus, a hermit near Autun (c. 570) West, before the Schism 6 November
- New Hieromartyr Leonid (Molchanov), Abbot of the Sovlvychegodsk Monastery, Vologda (1918) 31 October
- New Hieromartyr Leonid Antoshchenko, Bishop of Mariisk (1938) 26 December
- New Hieromartyr Leonid Muravev, Priest (1941) 29 October
- Martyrs Leonid Salkov and Peter Antonov, of Alma-Ata (1938) 22 February
- New Hieromartyr Leonid Serebrennikov, Priest (1918) 25 December
- New Hieromartyr Leonid Vinogradov, Priest (1941) 30 October
- Venerable Leonid, founder of Ust-Neduma Monastery in Vologda, Abbot (1654) 17 July
- New Hieromartyrs Leonidas Biryukovich, John Nikolsky, and Nicholas Dobroumov, Priests (1937) 12 August
- Martyrs Leonidas of Nea Epidavros, and those with him (250 or 258) 16 April
- New Hieromartyr Leonidas Prendkovich, Priest (1938) 30 September
- Saint Leonidas, Bishop of Athens (250) 15 April
- Martyr Leonides of Alexandria, Bishop (202) 22 April
- Martyr Leonides, by fire 2 September
- Saint Leonien (Leonardo, Leoniano, Leonianus, Leonine, Leoninus, Lezin) of Vienne, Gaul (518) West, before the Schism 13 November
- Saint Leonorius (Léonor, Lunaire) (c. 570) West, before the Schism 1 July
- Martyr Leontini 26 October
- Venerable Saints Leontios and Leontios, of Mt. Athos 26 October
- Saint Leontius (Leo), Patriarch of Constantinople (1143) 12 November
- New Hieromartyr Leontius (von Vimpfen), Bishop of Enotaeva, and those with him (1919) 23 June
- New Hieromartyrs Leontius Grimalsky, Archpriest, of Gzhel, Moscow, and Zosima Trubachev, Archpriest, of Maloyaroslavets (1938) 13 February
- Saint Leontius II (the Younger), a soldier who served against the Visigoths, he became Bishop of Bordeaux and participated in the Council of Paris of 553 (c. 565) West, before the Schism 11 July
- Saint Leontius II of Jerusalem, Patriarch of Jerusalem (1190) 14 May
- Saint Leontius of Lycia (6th century) 22 February
- Venerable Leontius of Rădăuți, Bishop of Rădăuți in Moldavia (1432) 1 July
- Saint Leontius of Saintes, Bishop of Saintes (640) West, before the Schism 19 March
- Saint Leontius the Elder, Bishop of Bordeaux in France and the predecessor of St Leontius the Younger (c. 541) West, before the Schism 21 August
- Saint Leontius the Governor, at Terracina (1st century or 268) 7 October
- Venerable Leontius the Myrrh-gusher (Leontius the Hagiorite), of Argos and of Dionysiou monastery on Mount Athos, clairvoyant (1605) 18 June
- New Hieromartyr Leontius the Mystic of Ternopil and Jablechna monastery, Poland (1972) 27 January
- Saint Leontius the Philosopher, of St. Sabbas Monastery (624) 19 October
- Venerable Leontius the Shepherd, monk 18 June
- Saint Leontius, Bishop of Fréjus in France from c. 419 to c. 432, a great friend of Saint John Cassian who dedicated his first ten Conferences to him West, before the Schism 1 December
- Venerable Leontius, canonarch of the Kiev Caves (14th century) 18 June
- New Hieromartyr Leontius, Deacon (1940) 21 December
- Saints Leontius, Dometius, Terence and Domninus, martyrs by fire 16 October
- Saint Leontius, founder of Karikhov Monastery, in Novgorod (1492) 18 July
- Martyrs Leontius, Hypatius and Theodoulos at Tripoli in Phoenicia (70–79) 18 June
- Venerable Leontius, Monk of Monemvasia and Achaia (1452) 11 December
- Saint Leopardinus, monk and Abbot of St Symphorian of Vivarais in Berry in France, murdered and venerated as a martyr (7th century) West, before the Schism 24 November
- Saint Leopardus, a servant or slave in the household of Julian the Apostate, likely martyred in Rome (362) West, before the Schism 30 September
- Saint Leothadius (Léothade), Abbot of Moissac Abbey in the south of France, later he became Bishop of Auch (718) West, before the Schism 23 October
- Saint Leovigild and Christopher, monks, martyred in Córdoba under Abderrahman II (852) West, before the Schism 19 August
- Martyr Leptina, dragged to death 26 October
- Saint Leucius the Confessor, Bishop of Brindisi (Brentisiopolis) (5th century) West, before the Schism 20 June
- Venerable Leucius, Abbot of Volokolamsk (1492) 7 April, 17 August
- Saint Leucius, venerated as the first Bishop of Brindisi, where he had come as a missionary from Alexandria (180) West, before the Schism 11 January
- Saint Leudomer (Lomer), Bishop of Chartres in France (c. 585) West, before the Schism 2 October
- Saint Leutfrid (Leufroi), founder of the monastery La Croix-Saint-Ouen (later called Saint-Leufroy) near Evreux in France, where he was abbot for nearly... (738) West, before the Schism 21 June
- Venerable Levan (Selevan), who came to Cornwall and gave his name to St Levan (6th century) West, before the Schism 8 June
- Saint Lewina (Leofwynn), a Briton and virgin-martyr venerated in Seaford in Sussex, England (5th century) West, before the Schism 24 July
- Saint Liafdag, Bishop in Jutland in Denmark, martyred by pagans (c. 980) West, before the Schism 3 February
- Saint Libentius (Liäwizo I), born in Swabia in Germany, he became Archbishop of Hamburg in 988 (1013) West, before the Schism 4 January
- Saint Liberalis of Treviso, priest from the area near Ancona in Italy who worked for the conversion of the Arians and suffered much at their hands (400) West, before the Schism 27 April
- Saint Liberata of Como, a holy virgin in Como in Italy where with her sister Saint Faustina she founded the convent of Santa Margarita (580) West, before the Schism 18 January
- Saint Liberata, sister of Saint Epiphanius of Pavia, Italy and Saint Honorata of Pavia (5th century) West, before the Schism 16 January
- Saint Liberator, Bishop, Martyr West, before the Schism 15 May
- Martyrs Liberatus and Bajulus, at Rome West, before the Schism 20 December
- Hieromartyrs Liberatus, Boniface, Servus, Rusticus, Rogatus, Septimus, and Maximus, under the Arian King Hunneric (483) West, before the Schism 17 August
- Saint Liberius of Ravenna, Bishop of Ravenna in Italy, venerated as one of the founders of that diocese (c. 200) West, before the Schism 30 December
- Saint Liberius the Confessor, Pope of Rome (366) 27 August
- Saint Libert of Saint-Trond, baptized and educated by St. Rumoldus, he became a Benedictine monk (783) West, before the Schism 14 July
- Saint Liborius of Le Mans, Bishop of Le Mans in France from 348 to 390, he is the patron saint of Paderborn in Germany where his relics were moved in 836 West, before the Schism 23 July
- Virgin-martyrs Libya and Leonides, sisters, and Eutropia, a girl of twelve years, at Palmyra, in Syria (304) 15 June
- Virgin-martyrs Libya, Leonis, and Eutropa, of Palermo in Sicily (303) 25 June
- Saint Licerius (Lizier), Bishop of Couserans (c. 548) West, before the Schism 27 August
- Saint Licinius of Angers (Lesin, Lezin), chosen Bishop of Angers in 586 and consecrated by St Gregory of Tours (c. 616) West, before the Schism 1 November
- Saint Licinius of Angers (Lezin), Bishop of Angers in France (c. 618) West, before the Schism 13 February
- Saint Liephard, a bishop and companion of King Cædwalla of Wessex during the latter's pilgrimage to Rome, martyred near Cambrai in France (690) West, before the Schism 4 February
- Saint Linus, the first Pope of Rome (c. 76) West, before the Schism 4 January, 23 September
- Saint Lioba, Abbess of Tauberbischofsheim, English missionary to Germany (c. 781) West, before the Schism 28 September
- Venerable Liphardus (Lifard), a prominent lawyer in Orleans in France, who at the age of fifty founded the monastery of Meung-sur-Loire, Confessor (c. 550) West, before the Schism 3 June
- Saint Litorius, Bishop of Tours (370) West, before the Schism 13 September
- Saint Liudhard (Letard), Chaplain and Bishop of Queen Bertha of Kent (c. 600) West, before the Schism 24 February
- Living-Martyr Eubotius, at Cyzicus (320) 18 December
- New Hieromartyr Liviu (Galaction) of Cluj, professor in theology at Cluj-Napoca, Confessor of the Faith in communist Romania (1961) 8 March
- Saint Lleudadd (Laudatus), first Abbot of Bardsey Island, Wales (6th century) West, before the Schism 15 January
- Saints Llewellyn (LLywelyn) and Gwrnerth, monks from Wales who lived in Welshpool and later on Bardsey (6th century) West, before the Schism 7 April
- Saint Llibio, the patron-saint of Llanlibio in Anglesey in Wales (6th century) West, before the Schism 28 February
- Saint Llinio of Llandinam, Abbot and Founder of Llandinam, Powys, Wales (520) West, before the Schism 17 March
- Saint Loarn, a disciple of St Patrick of Ireland (5th century) West, before the Schism 30 August
- Saint Lolanus, a bishop in Scotland (c. 1034) West, before the Schism 2 September
- Martyr Lolianus, kicked to death 15 July
- Martyr Lollian the Elder 20 March
- Martyr Lollion the Younger (Lollion the New) 27 April
- Saint Lommán of Trim (Luman), a nephew of St Patrick and the first Bishop of Trim in Meath in Ireland (c. 450) West, before the Schism 17 February
- Venerable Longinus of Egypt (4th century) 17 November
- Martyr Longinus the Centurion who stood at the Cross of the Lord and at his Tomb (1st century) 16 October
- Venerable Longinus the Gate-keeper of the Kiev Caves (13th-14th centuries) 16 October
- Saint Longinus, founder of Koryazhemka Monastery in Vologda, monastic (1540) 10 February
- Saint Longinus, Hiero-Schemamonk of Svyatogorsk Monastery (1882) 14 July
- Saints Lonochilus (Longis, Lenogisil), priest who founded a monastery in Maine in France (653), and Agnofleda, a holy virgin (638) West, before the Schism 2 April
- Saint Lotharius (Loyer), Bishop of Séez (c. 756) West, before the Schism 14 June
- Saint Louthiern, born in Ireland, he is the patron-saint of St Ludgran in Cornwall (6th century) West, before the Schism 17 October
- Martyr Luarsab II, King of Georgia (1622) 21 June
- Saint Lubuinus, missionary to Friesland (773) West, before the Schism 16 November
- Saint Lucanus, a martyr in Lagny in France, where his relics were enshrined (5th century) West, before the Schism 30 October
- Virgin Martyr Lucia (Lucy) of Syracuse (304) West, before the Schism 13 December
- Hieromartyr Lucian (priest, the "Apostle of Beauvais"), and martyrs Maximian and Julian, in Beauvais in the north of France (290) West, before the Schism 8 January
- Hieromartyr Lucian of Antioch, Presbyter of Greater Antioch (312) 15 October
- Hieromartyrs Lucian the bishop, Maxianus the presbyter, Julian the deacon, and Martyrs Marcellinus and Saturninus, at Beauvais in Gaul (c. 81-96) 3 June
- Saint Lucian, Abbot, of Alexandrov (1654) 8 September
- Hieromartyr Lucian, Hieromonk of the Kiev Caves (1243) 15 October
- Martyrs Lucian, Metrobius, Paul, Zenobius, Theotimus and Drusus, in Tripoli in North Africa West, before the Schism 24 December
- Saint Lucidius of Verona, Bishop of Verona in Italy West, before the Schism 26 April
- Saint Lucidus of Aquara, a monk of St Peter's near Aquara, in the south of Italy (c. 938) West, before the Schism 28 July
- Martyrs Lucillian and those with him, at Byzantium (c. 270-275) 3 June
- Saint Lucina, an early martyr in Rome West, before the Schism 30 June
- Saint Lucius I, succeeded St Cornelius as Pope of Rome in 253, and was at once sent into exile West, before the Schism 4 March
- Hieromartyr Lucius of Adrianople (348) 11 February
- Martyr Lucius the Senator, of Cyprus (c. 310) 20 August
- Saint Lucius, King of Britain who requested missionaries for his people in 187, founding the dioceses of London and Llandaff (2nd century) West, before the Schism 3 December
- Martyrs Lucius, Rogatus, Cassian and Candida, in Rome West, before the Schism 1 December
- Saints Lucius, Silvanus, Rutulus, Classicus, Secundinus, Fructulus and Maximus, martyrs in North Africa West, before the Schism 18 February
- Virgin-martyr Lucretia, in Mérida in the west of Spain (306) West, before the Schism 23 November
- Martyrs Lucy and Geminian, a widow and a neophyte martyred together in Rome under Diocletian (c. 300) West, before the Schism 16 September
- Martyrs Lucy and her son Geminian of Rome (303) 17 September
- Virgin-martyr Lucy of Campania, Martyr Rixius the Imperial Vicar, 24 others beheaded with them, and many other martyrs in Campania (301) 6 July
- Saint Ludger, missionary bishop in the Netherlands and northwestern Germany (809) West, before the Schism 26 March
- Martyr Ludmilla, grandmother of St. Wenceslaus, Prince of the Czechs (927) 16 September
- Saint Ludolf, Abbot of New Corvey (Nova Corbeia) in Westphalia in Germany from 971 to 983 West, before the Schism 13 August
- Saint Ludwin (Leudwinus, Liutwin, Leodwin), Founder of Mettlach in Germany and then Bishop of Trier (c. 713) West, before the Schism 29 September
- Saint Lufthild, a saint honoured near Cologne in Germany, where she lived as an anchoress (c. 850) West, before the Schism 23 January
- Saint Lugid of Killaloe (Lua, Molua), a disciple of St Comgall, founded many monasteries (c. 609) West, before the Schism 4 August
- New Monk-martyrs Luke (Mukhaidze) (1277) and Nicholas (Dvali) (1314), of Jerusalem, and the holy fathers of the Georgian monasteries in Jerusalem 12 February
- Saint Luke of Demena, Sicily (984) 13 October
- Venerable Luke of Lycaonia, third Abbot of the Monastery of the Deep Stream, in Triglia, near Constantinople (after 975) 7 September
- Venerable Luke of Sicily (Leo Luke of Corleone, Leoluca), Abbot of the Monastery of Mount Mula in Calabria and Wonderworker (c. 915) West, before the Schism 1 March
- Venerable Luke of Tauromenium, monk, of Sicily (820) 6 November
- Venerable Luke the Hermit 27 June
- New Monk-martyr Luke the New of Adrianople and Mt. Athos, at Mytilene (1802) 23 March
- Saint Luke the New Stylite of Chalcedon (979) 11 December
- Martyr Luke the Soldier, by fire 14 August
- Venerable Luke the Younger (Luke of Mt. Steiris, Luke Thaumaturgus, Luke of Hellas), founder of the Monastery of Hosios Loukas (953) 7 February
- Venerable Luke, Abbot of the Monastery of the Deep Stream in Triglia in Bithynia 27 December
- Saint Luke, Bishop of Novgorod (1059) 4 November
- Saint Luke, steward of the Kiev Caves (13th century) 6 November
- Venerable Luke, steward of the Kiev Caves (13th century) 24 November
- Saint Lullus, the first permanent Archbishop of Mainz, succeeding Saint Boniface, Confessor (787) West, before the Schism 16 October
- Martyr Luperculus (3rd century) West, before the Schism 1 March
- Saint Luperius, Bishop of Verona and Confessor (6th or 8th century) West, before the Schism 15 November
- Saints Lupicinus and Felix, Bishop of Lyon in France (5th century) West, before the Schism 3 February
- Saint Lupicinus of Condat, desert-dweller of the Jura Mountains, Gaul (480) West, before the Schism 21 March
- Saint Lupicinus of Lipidiaco, Gaul (500) West, before the Schism 24 January
- Saint Lupicinus of Verona, Bishop of Verona, described as 'the most holy, the best of bishops' (5th century) West, before the Schism 31 May
- Saint Lupus (Luperius), Bishop of Verona in Italy, Confessor West, before the Schism 2 December
- Martyr Lupus (Lypp), slave of St. Demetrius of Thessalonica (306) 26 October
- Saint Lupus of Bayeux, Bishop of Bayeux (5th century) West, before the Schism 25 October
- Saint Lupus of Châlons, Bishop of Châlons-sur-Saone, famous for his charity to the afflicted (c. 610) West, before the Schism 27 January
- Saint Lupus of Lyon, Archbishop of Lyon (542) West, before the Schism 25 September
- Martyr Lupus of Novae (306), slave of St. Demetrius of Thessaloniki 23 August
- Saint Lupus of Sens, a monk at Lérins who became Bishop of Sens in France in 609 (623) West, before the Schism 1 September
- Saint Lupus of Soissons, a nephew of St Remi of Rheims who became Bishop of Soissons (c. 540) West, before the Schism 19 October
- Saint Lupus the Confessor, Bishop of Troyes, Gaul (479) West, before the Schism 29 July
- Martyrs Luxorius, Cisellus and Camerinus, martyrs in Sardinia beheaded under Diocletian (303) West, before the Schism 21 August
- Martyr Lycarion of Tanis (Hermopolis) in Egypt 7 June
- Saint Lydia of Thyatira (Lydia of Philippi), mentioned in Acts 16:14-15 (1st century) 20 May
- New Martyrs Lydia, with soldiers Alexei and Cyril, near Ufa (1928) 20 July
- Saint Lythan (Llythaothaw), a saint in Wales to whom two churches are dedicated West, before the Schism 1 September
- Saint Lyubov of Ryazan, Fool-for-Christ (1921) 8 February
- Saint Lyutius, a monk at Montecassino who died as a hermit at La Cava Abbey in Italy (c. 1038) West, before the Schism 28 July