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- Saint Fabian, Pope of Rome (250) West, before the Schism 20 January
- Saint Fabiola, a patrician in Rome who gave up all earthly pleasures and devoted herself to the practice of Christian asceticism and charitable work (399) West, before the Schism 27 December
- Saint Fabius, a soldier beheaded in Caesarea in Mauretania in North Africa under Diocletian, for refusing to carry a standard bearing idolatrous emblems (300) West, before the Schism 31 July
- Saints Fabrician and Philibert, martyrs in Toledo, Spain West, before the Schism 22 August
- Saint Fachanan, Abbot of Rosscarbery, Cork, Ireland (c. 600) West, before the Schism 14 August
- Saint Faciolus, a monk at the monastery of St Cyprian in Poitiers in France (c. 950) West, before the Schism 7 September
- Saint Facundinus, Bishop of Taino in Umbria (c. 620) West, before the Schism 28 August
- Saints Facundus and Primitivus (c. 300) West, before the Schism 27 November
- Saint Fáilbe mac Pípáin, the eighth Abbot of Iona in Scotland (680) West, before the Schism 22 March
- Saint Failbhe the Little (Fáilbe mac Pípáin), Abbot of Iona in Scotland, where he reposed at the age of eighty (754) West, before the Schism 10 March
- Virgin Martyr Faith (Foi. Foy), a holy virgin in Agen in the south of Gaul (France), burnt to death with companions under Maximian Herculeus (3rd century) West, before the Schism 6 October
- Saint Falco of Maastricht, Bishop of Maastricht in the Netherlands (512) West, before the Schism 20 February
- Saint Fanchea of Killeany (Fanchea of Rossory), sister of Saint Enda of Aran (c. 520) West, before the Schism 1 January
- Saint Fandilas, a priest and Abbot of Peñamelaria near Cordoba in Spain, beheaded in Cordoba by order of the Emir Mohammed (853) West, before the Schism 13 June
- Venerable Fantinus of Calabria, the Wonderworker, in Thessalonica (974) West, before the Schism 30 August
- Saint Fantinus the Younger, of Calabria (c. 1000) 14 November
- Saint Fara (Burgundofara) of Eboriac, now Faremoutiers (657) West, before the Schism 3 April
- Saint Farannan, Confessor, a disciple of St Columba at Iona in Scotland (c. 590) West, before the Schism 15 February
- Saint Faro, Bishop of Meaux in France (626), he greatly encouraged monasticism, confessor (675) West, before the Schism 28 October
- The Venerable Fathers martyred at the Monastery of St. Sabbas (796) 20 March
- The Venerable Fathers of Georgia: Saint John of Zedazeni in Georgia, and his 12 disciples (6th century) 7 May
- The Holy Fathers slain at Mount Sinai and Raithu (4th-5th century), including the Holy 38 Fathers slain at Mount Sinai, and the Holy 33 Fathers slain at Raithu 14 January
- Saint Fausta of Sirmium, the mother of Saint Anastasia of Sirmium (3rd century) West, before the Schism 19 December
- Virgin-martyr Fausta, and with her Martyrs Evilasius and Maximus, at Cyzicus (305-311) 6 February
- Saint Faustinian, second Bishop of Bologna in Italy (4th century) West, before the Schism 26 February
- Saint Faustinus (4th century) West, before the Schism 29 July
- Martyrs Faustinus and Companions, a group of forty-five martyrs honoured in Rome West, before the Schism 17 February
- Saints Faustinus and Jovita, two brothers, belonging to the nobility of Brescia in Italy, zealous preachers of Orthodoxy, beheaded in their native city... (2nd century) West, before the Schism 15 February
- Saint Faustinus of Brescia, Bishop of Brescia and Confessor (381) West, before the Schism 16 February
- Martyrs Faustinus, Lucius, Candidus, Caelian, Mark, Januarius and Fortunatus, in North Africa West, before the Schism 15 December
- Saints Faustus and Companions, 24 martyrs in Rome West, before the Schism 24 June
- Saint Faustus of Riez, Bishop of Riez (495) West, before the Schism 28 September
- Saint Faustus, a disciple of St Benedict at Montecassino in Italy (6th century) West, before the Schism 15 February
- Saint Faustus, a soldier martyred in Milan in Italy under Commodus (c. 190) West, before the Schism 7 August
- Saint Faustus, Abbot of the monastery of Santa Lucy in Syracuse in Sicily (c. 607) West, before the Schism 6 September
- Martyrs Faustus, Basil and Lucianus, of Darion in Constantinople, by the sword 6 February, 25 October
- Martyr Faustus, by crucifixion, under Decius (c. 249-251) 16 July
- Saints Faustus, Januarius and Martial, martyrs in Cordoba in Spain under Diocletian, called "The Three Crowns of Cordoba" (304) West, before the Schism 13 October
- Saint Faustus, son of St Dalmatius of Pavia in Italy, lived the life of a holy monk (5th century) West, before the Schism 3 August
- Saint Febronia (632), daughter of Emperor Heraclius 28 October
- Saint Febronia (Trofimena), virgin-martyr of Sicilly (c. 304) West, before the Schism 5 July
- Virgin-martyr Febronia of Nisibis (304) 25 June
- Saint Féchín (Fechinus), founded Fore Abbey at Meath (665) West, before the Schism 20 January
- Saint Felician of Foligno, Bishop of Foligno, martyr (251) West, before the Schism 20 October
- Saint Felician, Bishop of Foligno, Italy (254) West, before the Schism 24 January
- Martyrs Felician, Philippian and Companions, a group of one hundred and twenty-six martyrs in North Africa West, before the Schism 30 January
- Saint Felicissimus, a martyr who suffered in Perugia in Italy, probably under Diocletian (c. 303) West, before the Schism 24 November
- Martyrs Felicissimus, Heraclius, and Paulinus, at Todi in Umbria (303) West, before the Schism 26 May
- Saint Felicitas of Padua, nun, probably at Sts Cosmas and Damian in Padua in Italy (9th century) West, before the Schism 26 March
- Martyr Felicitas of Rome, and her seven sons (c. 164) West, before the Schism 25 January
- Saint Felicity, a widow martyred with her sons either in Rome or else in North Africa under Decius, buried in Rome (c. 165) West, before the Schism 23 November
- Saint Felicula, a virgin-martyr in Rome under Domitian (c. 90) West, before the Schism 13 June
- Martyrs Felinus and Gratinianus (250) West, before the Schism 1 June
- Martyrs Felix (Africanus), Audactus (Adauctus), Januarius, Fortunatus and Septimus (303) West, before the Schism 24 October
- Saints Felix and Augebert, missionaries killed by pagans in Champagne (7th century) West, before the Schism 6 September
- Saint Felix and Companions, a group of twenty-one martyrs in North Africa (5th century) West, before the Schism 23 March
- Saint Felix and Constantia, martyrs under Nero in Nocera near Naples, in Italy (1st century) West, before the Schism 19 September
- Saints Felix and Cyprian, Bishops in North Africa, with 4966 martyrs, under Hunneric (c. 484) West, before the Schism 12 October
- Saint Felix and Eusebius, martyrs in Terracina, between Rome and Naples in Italy (1st century) West, before the Schism 5 November
- Saints Felix and Fortunatus, two brothers, born in Vicenza in Italy, who suffered under Diocletian in Aquileia (296) West, before the Schism 11 June
- Martyrs Felix and Gennadius, at Uzalis in Africa West, before the Schism 16 May
- Saints Felix and Maurus, father and son who lived as hermits at what is now called San Felice near Narni in central Italy (6th century) West, before the Schism 16 June
- Saints Felix and Regula, brother and sister, martyred near Zurich (3rd century) West, before the Schism 11 September
- Saint Felix III, Pope of Rome (530) West, before the Schism 22 September
- Saint Felix III, Pope of Rome from 483-492 West, before the Schism 1 March
- Saint Felix of Brescia, twentieth Bishop of Brescia (c. 650) West, before the Schism 23 February
- Saint Felix of Burgundy, Bishop of Dunwich and Enlightener of East Anglia (c. 648) West, before the Schism 8 March
- Saint Felix of Como, the first Bishop of Como in Italy, he was a friend of St Ambrose (c. 390) West, before the Schism 14 July
- Monk-martyr Felix of Fritzlar, a monk at Fritzlar in Germany, probably at the hands of heathen (790) West, before the Schism 5 June
- Saint Felix of Metz, third Bishop of Metz in France for over forty years (2nd century)) West, before the Schism 21 February
- Saint Felix of Montecassino (ca. 1000) West, before the Schism 23 March
- Saint Felix of Nantes, a great Bishop of Nantes in France for some thirty-three years (584) West, before the Schism 7 July
- Saint Felix of Nola, first Bishop of Nola near Naples in Italy, martyred with thirty companions (287) West, before the Schism 15 November
- Saint Felix of Pavia, a martyr in Pavia in Italy West, before the Schism 15 July
- Saint Felix of Pistoia, a holy hermit in Pistoia in Tuscany in Italy (9th century) West, before the Schism 26 August
- Saint Felix of Rhuys, a monk at Fleury Abbey (Saint-Benoit-sur-Loire) in France (1038) West, before the Schism 4 March
- Saint Felix of Seville, deacon and martyr in Seville, Spain, under the Muslims West, before the Schism 2 May
- Saint Felix of Sutri, a priest of Sutri in Lazio in Italy, scourged to death under Valerian and Gallienus (257) West, before the Schism 23 June
- Saint Felix of Thynissa, a martyr who suffered in Thynissa near Hippo (Bone) in North Africa West, before the Schism 6 November
- Saint Felix of Trier, consecrated Bishop of Trier in Germany by St Martin of Tours in 386 (ca. 400) West, before the Schism 26 March
- Saint Felix of Verona (Felicinus, Felice), Bishop of Verona in Italy, venerated from ancient times as a saint West, before the Schism 19 July
- Hieromartyr Felix the Presbyter and Eusebius the Deacon, by the sword 19 October
- Saint Felix, a monk at a monastery in Fondi in the south of Italy (6th century) West, before the Schism 6 November
- Saint Felix, a presbyter at Nola near Naples, Italy, sometimes referred to as a martyr (c. 250) West, before the Schism 14 January
- Hieromartyr Felix, and Martyrs Fortunatus, Septiminus and Januarius, by beheading (c. 304) West, before the Schism 30 August
- Saint Felix, Bishop of Bourges (c. 580) West, before the Schism 1 January
- Hieromartyrs Felix, Bishop of Spoleto, and Januarius, Presbyter, and Martyrs Septeminus and Fortunatus, of Lycaonia (294 or 304) 16 April
- Hieromartyr Felix, Bishop of Spoleto, in Umbria (304) West, before the Schism 18 May
- Saint Felix, fifth Bishop of Bologna, previously a Deacon of the Church of Milan under Saint Ambrose of Milan (429) West, before the Schism 4 December
- Martyrs Felix, Fortunatus, and Achilleus, at Valence in France (212) West, before the Schism 23 April, 24 April
- Martyrs Felix, Luciolus, Fortunatus, Marcia and Companions, a group of forty martyrs in North Africa West, before the Schism 3 March
- Martyrs Felix, Symphronius (Sempronius), Hippolytus and Companions, a group of martyrs in North Africa West, before the Schism 3 February
- Female Martyr of Old Rome, by being burned alive, for refusing Arianism West, before the Schism 7 December
- Venerable Feodor (Theodore) Kuzmich of Tomsk (1864) 20 January
- Saint Feodor I of Russia (Fyodor (Theodore) I Ivanovich), last Rurikid Tsar of Russia (1598) 7 January
- Saint Feredarius (Feradach mac Cormaic), Abbot of Iona (c. 880) West, before the Schism 18 May
- Saint Fergna, called 'the White', a relative and disciple of St Columba of Ireland, Abbot of Iona (637) West, before the Schism 2 March
- Saint Fergus of Glamis, born in Ireland, he was a bishop who preached among the Picts in Perthshire, Caithness, Buchan and Forfarshire in Scotland (c. 721) West, before the Schism 27 November
- Saint Fergus, Bishop of Downpatrick in Ireland (6th century) West, before the Schism 30 March
- Saint Ferréol (Ferreolus, Fergéol), Bishop of Grenoble (c. 670) West, before the Schism 16 January
- Saint Ferreolus of Uzès, Bishop of Uzès (581) West, before the Schism 4 January
- Martyr Ferreolus, an army officer, he was martyred in Vienne in France under Diocletian (3rd century) West, before the Schism 18 September
- Saint Ferreolus, fifth Bishop of Limoges in France (c. 591) West, before the Schism 18 September
- Saints Ferreolus, Priest, and Ferrutio, Deacon, brothers from Asia Minor (c. 212) West, before the Schism 16 June
- Saint Ferrutius of Mainz, Germany West, before the Schism 28 October
- Saint Fiace (Fiech), a bishop in Ireland, friend and disciple of St Patrick, in whose honour he wrote a hymn which still exists (5th century) West, before the Schism 12 October
- Saint Fiachan of Lismore (Fiachina, Fianchne, Fianchine), a monk at Lismore and a disciple of St Carthage the Younger (7th century) West, before the Schism 29 April
- Saint Fiacrius (Fiacre, Fiaker, Fèvre), Irish hermit and hospice-founder at Breuil in Brie (c. 670) West, before the Schism 30 August
- Saint Fibitius, Abbot of a monastery in Trier in Germany, and the twenty-first bishop of that city (c. 500) West, before the Schism 5 November
- Martyr Fidelis of Como, an Italian soldier-saint, martyred in Lombardy under Maximian Herculeus (304) West, before the Schism 28 October
- Saint Fidelis, a martyr in North Africa West, before the Schism 23 March
- Saint Fidelis, Bishop of Mérida (c. 570) West, before the Schism 7 February
- Saints Fidentius and Terence, martyrs venerated in Todi in central Italy West, before the Schism 27 September
- Saint Fidentius Armenus, an early saint in Padua in Italy (2nd century) West, before the Schism 16 November
- Saint Fidharleus, restorer of the monastery of Rathin in Ireland (762) West, before the Schism 1 October
- Saint Fidolus (Phal), Abbot at Isle-Aumont, south of Troyes (c. 540 - 549) West, before the Schism 16 May
- Saint Fidweten (Fivetein, Fidivitanus), a monk and disciple of Saint Convoyon at Redon Abbey in Brittany (c. 888) West, before the Schism 11 December
- Saint Fillan (Foelan, Foellan, Foilan), Abbot of Strath Fillan, born in Ireland, he accompanied his mother, Saint Kentigerna, and his relative, Saint... (8th century) West, before the Schism 9 January
- Saint Filofteia Antonescu, Schemanun, from Pasărea Monastery, mother of St. Calinic of Cernica (1833) 12 April
- Saint Filotimia Manolache, Nun from Râmeț Monastery, mother of Venerable Dometie the Merciful of Râmeț (1989) 6 July
- Saint Finan (Finnian) (6th century) West, before the Schism 7 April
- Saint Finan of Lindisfarne, Bishop of Lindisfarne (661) West, before the Schism 17 February
- Saint Finbar, an Abbot of Innis-Doimhle, in Wexford, Ireland (6th century) West, before the Schism 4 July
- Saint Finbarr of Cork (Barrocus, Barry), first Bishop of Cork (c. 633) West, before the Schism 25 September
- Saint Findan (Fintan), hermit (879) West, before the Schism 15 November
- Saint Findlugan of Islay (Finlaggan, Fionn Lugain) (7th century) West, before the Schism 3 January
- Saints Fingar (Gwinear) and Phiala, brother and sister, and Companions, martyrs in Cornwall (5th century) West, before the Schism 14 December
- Saint Finian Lobhar, Abbot of Swords Abbey near Dublin (c. 560) West, before the Schism 16 March
- Saint Finian of Clonard and Skellig Michael, teacher of Ireland and one of the fathers of Irish monasticism (549) West, before the Schism 12 December
- Saint Finlugh of Derry (Finlag), a brother of Saint Fintan of Doon, he went to Scotland where he became one of Saint Columba's disciples; returning to... (6th century) West, before the Schism 3 January
- Saint Finnian of Movilla (Findbarr, Winnin), Abbot, in Ulster (579) West, before the Schism 10 September
- Saint Fintan Munnu (Finian), of Teachmunnu, Ireland (635) West, before the Schism 21 October
- Saint Fintan of Clonenagh, a disciple of St Columba, he led the life of a hermit in Clonenagh in Leix in Ireland, Confessor (603) West, before the Schism 17 February
- Saint Fintan of Doon, a disciple of Saint Comgall at Bangor in Ireland; he is honoured as the patron-saint of Doon in Limerick where his holy well still exists (6th century) West, before the Schism 3 January
- Saint Fionnchu, the successor of St. Comgall at the monastery of Bangor in Ireland (6th century) West, before the Schism 28 November
- Saints Firmatus, a Deacon, and Flaviana, a virgin, venerated as martyrs in Auxerre in France West, before the Schism 5 October
- Saint Firmian (Fermanus, Firminus), Abbot of San Sabino Piceno near Fermo in Italy (c. 1020) West, before the Schism 11 March
- Venerable Saints Firmilian, Bishop of Caesarea in Cappadocia (c. 269), and Malchion, priest of Antioch (late 3rd century) 28 October
- Saint Firmina, a virgin-martyr in Amelia (Ameria) in Umbria under Diocletian (c. 303) West, before the Schism 24 November
- Saint Firminus of Amiens, First Bishop of Amiens (4th century) West, before the Schism 25 September
- Hieromartyr Firminus of Amiens, third Bishop of Amiens in France (c. 303) West, before the Schism 1 September
- Saint Firminus of Metz, Greek or Italian by origin, he was Bishop of Metz in France for eight years, Confessor (496) West, before the Schism 18 August
- Saint Firminus of Uzès, born in Narbonne in the south of France, he became Bishop of Uzès (553) West, before the Schism 11 October
- Saint Firminus, Bishop of Viviers in France (6th century) West, before the Schism 29 March
- Saint Firminus, third Bishop of Gévaudan (Gabales), France West, before the Schism 19 January
- Saints Firmus and Rusticus, two relatives, probably citizens of Bergamo in the north of Italy, honoured in Verona under Maximian (c. 290) West, before the Schism 9 August
- Saint Firmus of Tagaste, in North Africa, he was tortured and endured terrible sufferings rather than betray the hiding-place of one of his flock West, before the Schism 31 July
- Martyr Firmus, under the eparch Magus (299) 1 June
- The holy Five Martyrs of Alamannia who suffered in Cyprus 13 July
- Five Martyrs of Ashkelon, by being dragged to death 31 May
- Five Martyrs of Nicomedia, by the sword 16 June
- Five Virgin-martyrs 6 June
- Holy Five Young Virgin-Martyrs of Lesbos, by the sword 5 April
- Saint Flannán, first Bishop of Killaloe, Ireland (7th century) West, before the Schism 18 December
- Saints Flavian (Flavinian, Flavius) of Autun, the twenty-first Bishop of Autun in France (7th century) West, before the Schism 23 August
- Saint Flavian I of Antioch, Archbishop of Antioch (404) 16 February, 27 September
- Saint Flavian the Confessor, Archbishop of Constantinople (449) 16 February, 18 February
- Venerable Flavian the Hermit, monastic and Wonderworker 16 February
- Saint Flavian, a deputy-prefect of Rome, martyred in Civitavecchia in Italy under Diocletian (c. 304) West, before the Schism 28 January
- Martyr Flavian, former Prefect of Rome (362) West, before the Schism 22 December
- Saint Flavianus II of Antioch, Patriarch and Confessor (518) 20 July
- Saint Flavius Clemens, Flavius Clemens, brother of the Emperor Vespasian and uncle of Titus and Domitian, he was beheaded for the Orthodox Faith (c. 96) West, before the Schism 22 June
- Saint Flavius Latinus of Brescia, third Bishop of Brescia in Italy (84-115) West, before the Schism 24 March
- Hieromartyr Flavius, and Martyrs Augustus and Augustinus, from Asia Minor (c. 284-305) 7 May
- New Hieromartyr Flegont Pongilsky, Archpriest, of Yaroslavl (1938) 10 April
- Saint Flocellus, a youth martyred in Autun in France under the Emperor Marcus Aurelius (161-180) West, before the Schism 17 September
- Saints Flora and Maria, two virgin-martyrs in Cordoba in Spain who gave themselves up to the Moors and were beheaded by order of Abderrahman II (851) West, before the Schism 24 November
- Saint Florentina (Florence), Abbess, of Spain (c. 636) West, before the Schism 20 June
- Saints Florentinus and Hilary, two hermits martyred in France by barbarians West, before the Schism 27 September
- Saint Florentinus of Trier, successor of St Severinus as Bishop of Trier in Germany (4th century) West, before the Schism 16 October
- Saint Florentius (Flann), Abbot of Bangor Abbey in Ireland (7th century) West, before the Schism 15 December
- Saints Florentius and Felix, two soldiers martyred under Maximinius the Thracian at Furcona near Aquila in the south of Italy (235) West, before the Schism 25 July
- Saint Florentius of Orange, the eighth Bishop of Orange in the south of France (c. 526) West, before the Schism 17 October
- Saint Florentius of Seville, Confessor, a saint much venerated in Seville in Spain (c. 485) West, before the Schism 23 February
- Saint Florentius of Strasbourg, Bishop of Strasbourg (c. 693) West, before the Schism 7 November
- Martyr Florentius of Thessalonica (1st-2nd centuries) 13 October
- Hieromartyr Florentius of Vienne, a martyred Bishop of Vienne in France (3rd century) West, before the Schism 3 January
- Saint Florentius, a martyr in Trois-Châteaux in Burgundy in France (3rd century) West, before the Schism 27 October
- Saint Florentius, founder of the monastery of Saint-Florent-le-Vieux (5th century) West, before the Schism 22 September
- Saints Florentius, Geminianus and Saturus, martyrs in Sirmium in Pannonia (4th century) West, before the Schism 6 April
- Martyr Florentius, in Thessaloniki, by fire 14 March
- Martyrs Florentius, Julian, Cyriacus, Marcellinus and Faustinus, beheaded in Perugia in central Italy under Decius (250) West, before the Schism 5 June
- Martyrs Florian and 40 companions, at Lorsch, Austria (304) West, before the Schism 4 May
- Saint Floribert (Florbert), Abbot of monasteries in Ghent, Mont-Blandin and Saint-Bavon in Belgium (c. 660) West, before the Schism 1 November
- Saint Floribert of Liège (746) West, before the Schism 27 April
- Martyrs Florus and Laurus of Illyria, twin brothers who worked as stonemasons (2nd century) 18 August
- Saint Florus of Lodève (Flour), first Bishop of Lodève in Languedoc in France (389) West, before the Schism 3 November
- Saint Florus, Bishop of Amisus (7th century) 18 December
- Saint Flosculus (Flou), Bishop of Orleans in France (c. 480) West, before the Schism 2 February
- Saint Foila (Faile), sister of St Colgan (6th century) West, before the Schism 3 March
- Monk-martyr Foillan, Irish missionary, of Burgh Castle (East Anglia) and Fosse (Gaul) (655) West, before the Schism 31 October
- Saint Folcwin (Folciunus), Bishop of Thérouanne (Tervas), Netherlands (855) West, before the Schism 14 December
- Saint Forannan, Abbot of Waulsort Abbey in Belgium (982) West, before the Schism 30 April
- Righteous Forefather Abraham and his nephew righteous Lot (c. 2000 B.C.) 9 October
- Holy Forefathers Abraham, Isaac, and Jacob (ca. 2000 BC) 21 August
- Saint Fort (Fort de Bordeaux), first Bishop of Bordeaux in France, venerated as a martyr (c. 1st century?) West, before the Schism 16 May
- Saint Fortchern, Bishop of Trim in Ireland, he later lived as a hermit (6th century) West, before the Schism 17 February
- Blessed Fortis Gabrielli, Ascetic (1040) West, before the Schism 13 May
- Saints Fortunatus and Lucian, martyrs in North Africa West, before the Schism 13 June
- Martyrs Fortunatus and Marcian West, before the Schism 17 April
- Saint Fortunatus of Naples, bishop (4th century) West, before the Schism 14 June
- Saint Fortunatus of Spoleto the Wonderworker (400) West, before the Schism 1 June
- Saint Fortunatus of Todi, a Bishop of Todi in Italy, who saved the city from being sacked by Totila the Goth (537) West, before the Schism 14 October
- Saint Fortunatus the Philosopher, a bishop driven from the north of Italy by the Lombards (c. 569) West, before the Schism 18 June
- Saint Fortunatus, a martyr in Rome (537?) West, before the Schism 15 October
- Apostles Fortunatus, Achaicus, and Stephanas, of the Seventy Apostles (1st century) 15 June
- Martyrs Fortunatus, Donatus, twelve virgins, and six laymen, at Sirmium (304) 9 April
- Saints Fortunatus, Gaius and Anthes, martyrs near Salerno in Italy under Diocletian (303) West, before the Schism 28 August
- Forty Martyrs of Rome, by fire 16 June
- The Holy Forty Martyrs of Sebaste (320) 9 March
- Forty soldier-martyrs of Rome, who suffered on the Via Lavicana, under Gallienus (262) West, before the Schism 13 January
- Venerable Fotou the Cypriot (Photini the Cypriot), the Wonderworker 2 August
- The Four Crowned Martyrs (c. 305) West, before the Schism 8 November, 9 November
- The Four Martyrs of Megara: Polyeuctos, George, Adrianos and Platon, the "Newly-Revealed" (1754, 1998) 1 February
- The Holy Four Martyrs of Tyre, by the sword 21 January
- Saints Fragan and Gwen Teirbron (Blanche) of Brittany (5th century) West, before the Schism 5 July
- Saint Franchy (Francovæcus), a monk at St Martin de la Bretonnière in France, later a hermit in the Nivernais, Diocese of Nevers (7th century) West, before the Schism 16 May
- Saint Fránquila (Frankila, Franklin), first abbot of the Monastery of San Salvador de Celanova, following the Rule of Saint Benedict (959) West, before the Schism 31 December
- Saint Fraternus, Bishop of Auxerre in France and by tradition a martyr (450) West, before the Schism 29 September
- Saint Frédégand (Frégô), born in Ireland, he was a disciple of St Foillan, and became a monk and Abbot of Kerkelodor Abbey near Antwerp in Belgium (c. 740) West, before the Schism 17 July
- Saint Frederick of Arras, a monk at St Vanne and later St Vedast Abbey in Arras (1020) West, before the Schism 6 January
- Saint Frederick of Utrecht, Bishop of Utrecht in the Netherlands, martyr bishop (838) West, before the Schism 18 July
- Saint Frediano (Frigidanus, Frigdianus), an Irish prince and hermit, and Bishop of Lucca (588) West, before the Schism 18 March
- Saint Fremund of Dunstable, Anglo-Saxon hermit, killed by his kinsman Oswy with the help of Danish invaders who had also murdered King Edmund (866) West, before the Schism 11 May
- Saints Friard (Friardus of Vindumitta), and Secundel (Secundellus) deacon, hermits on the Isle of Vindomitte near Nantes in Gaul (c. 577) West, before the Schism 1 August
- Saint Friardus of Vindumitta in Gaul (c. 577) 2 August
- Saint Frideswide of Oxford, Royal Abbess, patroness saint of Oxford (c. 735) West, before the Schism 19 October
- Saint Fridolin of Säckingen, abbot, Enlightener of the Upper Rhine (540) West, before the Schism 6 March
- Saint Friminus, the seventh Bishop of Verdun in France (6th century) West, before the Schism 5 December
- Saint Frithbert, successor of Saint Acca as Bishop of Hexham, where he served for thirty-four years (766) West, before the Schism 23 December
- Saint Frithestan, a disciple of St Grimbald, he was consecrated Bishop of Winchester in England by St Plegmund (933) West, before the Schism 10 September
- Saint Frodobert, a monk at Luxeuil in France, he founded the monastery of Moutier-la-Celle near Troyes, where he led a life of unceasing prayer and asceticism (673) West, before the Schism 8 January
- Saint Frodulphus (Frou), a monk at St Martin's in Autun (c. 750) West, before the Schism 21 April
- Saint Froilan, Bishop of Léon (1006) West, before the Schism 3 October
- Saint Fromundus (Frodemundus), Monk, Abbot and then Bishop of Coutances in France (c. 690) West, before the Schism 24 October
- Saints Front and George, Bishops and Apostles of Périgueux, in France (2nd century) West, before the Schism 25 October
- Martyrs Frontasius, Severinus, Severian, and Silanus, of Gaul (1st century) West, before the Schism 4 June
- Saint Fructuosus of Braga in Iberia (665) West, before the Schism 16 April
- Hieromartyr Fructuosus, Bishop of Tarragona, Spain, and his deacons Augurius and Eulogius (259) West, before the Schism 21 January
- Saints Fructus (Frutos), Valentine and Engratia, two brothers and a sister who lived in Sépulveda in Castile in Spain (715) West, before the Schism 25 October
- Saint Frugentius, a monk at Fleury Abbey, martyred with St Aigulphus, Abbot of Lérins in France (675) West, before the Schism 3 September
- Saint Frumentius, Archbishop of Abyssinia (380) 30 November
- Saints Fugatius (Fagan) and Damian (Deruvian), sent by Pope Eleutherius to England to preach the Gospel (2nd century) West, before the Schism 26 May
- Saint Fulcran, Bishop of Lodève in Languedoc in France, famous for his asceticism, he was bishop for over half a century (1006) West, before the Schism 13 February
- Saint Fulgentius of Cartagena, Bishop of Ecija, Spain (630 or 632) West, before the Schism 14 January
- Saint Fulgentius, Bishop of Cartagena and Ecija (Astigi), Hispania (633) West, before the Schism 16 January
- Saint Fulgentius, Bishop of Ruspe in North Africa (533) West, before the Schism 1 January
- Saint Fulk (c. 600) West, before the Schism 22 May
- Saint Fulk of Fontenelle, twenty-first Abbot of Fontenelle Abbey in France (845) West, before the Schism 10 October
- Saint Fulk the Venerable, archbishop of Reims (900) West, before the Schism 17 June
- Saint Fulvianus (Fulvian) (in holy baptism Matthew), prince of Ethiopia (1st century) 16 November
- Saint Fursey, Irish missionary monk of Burgh Castle (East Anglia), Lagny, and Peronne (Gaul) (650) West, before the Schism 16 January
- Martyrs Fusca and Maura, two martyrs in Ravenna under Decius (c. 250) West, before the Schism 13 February
- Saint Fymbert, a bishop in the west of Scotland (7th century) West, before the Schism 25 September
- Saints Fyncana and Fyndoca, two martyrs in Scotland West, before the Schism 13 October