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- Saint Quadragesimus, a shepherd and subdeacon in Policastro in Italy who raised a man from the dead (c. 590) West, before the Schism 26 October
- Martyrs Quadratus (Codratos) of Nicomedia and his companions (251–259) 7 May
- Apostle Quadratus of the Seventy, Apologist (c. 130) 21 September
- Saint Quadratus, a Bishop of Utica in North Africa who taught both clergy and laity to confess Christ (3rd century) West, before the Schism 21 August
- Martyr Quadratus, a martyr in North Africa West, before the Schism 26 May
- Martyrs Quartus and Quintus, two citizens of Capua who were condemned and executed in Rome West, before the Schism 10 May
- Martyr Queen Shushanik (Susanna) of Georgia (475) 28 August, 17 October
- Saint Quentin (Quinctinus), martyr West, before the Schism 31 October
- Saint Quinctian (Kyntion), Bishop of Seleucia (4th century) 15 November
- Martyrs Quinctilian and Capatolinus, at Nicomedia 8 March
- Saint Quinidius, after living as a hermit in Aix in Provence, he became Bishop of Vaison in France (c. 579) West, before the Schism 15 February
- Saint Quintian and Saint Atticus West, before the Schism 30 April
- Saint Quintian of Rodez, a bishop in France (c. 525) West, before the Schism 14 June
- Saint Quintianus (Quintian), Bishop of Clermont, Gaul (525) West, before the Schism 13 November
- Martyrs Quintianus, Lucius and Julianus, with 19 other Christians in North Africa during the persecution of the Arian Vandals (430) West, before the Schism 23 May
- Saint Quintius of Tours (Quentin), a citizen of Tours, martyred at L'Indrois near Montrésor (6th century) West, before the Schism 4 October
- Saints Quintius, Arcontius and Donatus, martyrs venerated in Capua and elsewhere in the south of Italy West, before the Schism 5 September
- Martyr Quintus of Phrygia (c. 285) 2 July
- Saints Quintus, Quintilla, Quartilla, Mark and Companions, martyrs venerated in Sorrento near Naples in Italy West, before the Schism 19 March
- Martyrs Quintus, Simplicius and Companions, in North Africa under the Emperors Decius and Valerian (c. 255) West, before the Schism 18 December
- Martyrs Quiriacus, Maximus Archelaus and Companions () West, before the Schism 23 August
- Saint Quirinus of Sescia, Bishop of Siscia (Sisak or Seseg), now in Croatia (308) West, before the Schism 4 June
- Saint Quirinus of Tegernsee (Quirinus of Rome), a martyr who suffered in Rome under Claudius II (c. 269) West, before the Schism 25 March
- Saint Quirinus, a martyr in Tivoli near Rome West, before the Schism 4 June
- Saint Quirinus, the jailer of Pope Alexander I, martyr (c. 117) West, before the Schism 30 March
- Saint Quiteria the virgin-martyr, in Spain (5th century) West, before the Schism 22 May
- Saint Quodvultdeus, Bishop of Carthage in North Africa, exiled by the Arian Genseric King of the Vandals after the capture of the city in 439 (450) West, before the Schism 19 February