September 1 edit
Aaron; Adelphius of Metz; Aegydius; Aegydius of Castaneda; Aithala; Aithalas of Bet-Nuhadra; Saint Giles; Rabban Hormizd; Simeon Stylites;
September 2 edit
Abibus of Edessa; Acepsimas of Hnaita, Joseph of Bet-Katoba, and Aithalas of Bet-Nuhadra; Agnes; Agricolus; Clodia; Patriarch John IV of Constantinople;
September 3 edit
Abnodius; Pope Gregory I;
September 4 edit
Aaron; Aedhan Amlonn McLugar; Agatho, Peter, John, Ammon, Ammonius and Rebecca; Agilus; Babylas of Antioch; Pope Boniface I; Cuthbert of Lindisfarne;
September 5 edit
Abdas of Susa; Abdias; Abidas; Acontus, Nonnus, Herculanus & Taurinus; Aganus; Audias of Hormizd-Ardashi; Elizabeth (Biblical person); Lorenzo Giustiniani; Pope Zachary;
September 6 edit
Abibus; Faustus, Abibus and Dionysius of Alexandria; Zechariah (Hebrew prophet);
September 8 edit
Adrianus; Isaac of Armenia; Nativity of the Blessed Virgin Mary; Pope Sergius I;
September 9 edit
Adrianus;
September 10 edit
Achilleus; Adeltrudis; Agabius of Novara; Agnellus of Pisa; Saint Aubert; Nicholas of Tolentino;
September 11 edit
Adelphius; Aemilianus of Vercelli; Agatho the Stylite; Our Lady of Coromoto; Paphnutius of Thebes;
September 12 edit
Agatho the Stylite; Victoria Fornari-Strata;
September 13 edit
Aemilianus of Valence; Agatho the Silent; Agatahocles; Eulogius of Alexandria; John Chrysostom;
September 14 edit
Abraham and Onesimus of Kiev; Pope Cornelius; Feast of the Cross or Holy Cross Day; Mar Sawa the physician, Mar Bishoi, Mar Odisho, Mar Zaia, Mar Shaleeta and all Saints
September 15 edit
Abibo Joseph; Achard; Achatius; Adalbert of Echternach; Adalbert of Mettlach; Aicardus; Catherine of Genoa; Abibo Joseph;
September 16 edit
Abundius and Abundantius; Adalbero of Wurzburg; Adrianus; Afomya; Cyprian; Saint Ninian; Pope Victor III; Euphemia;
September 17 edit
Agathocleia; Hildegard of Bingen; Lambert of Maastricht;
September 19 edit
Acutius; Goeric of Metz; Goericus; Januarius; Theodore of Tarsus;
September 20 edit
Aedh McOissen; Pope Agapetus I; Agapius; Saint Eustace; Pope Martin I;
September 21 edit
Matthew, Apostle and Evangelist;
September 22 edit
Acutius; Aedh McSenach; Pope Felix IV;
September 23 edit
Abundius; Adamnan McRonan; Adamnan of Iona; Aunan McRonan; Eunan McRonan; Pope Linus; Thecla;
September 24 edit
Abraham of Miroshsk; Thecla;
September 25 edit
Abadir and Iraja; Nicholas of Flue; Sergius of Radonezh;
September 26 edit
Adrianus; Antoine Daniel; Canadian Martyrs; Charles Garnier (missionary); Cosmas and Damian; Gabriel Lallemant; Isaac Jogues; Jean de Brébeuf; Jean de Lalande; John the Apostle; Noël Chabanel; René Goupil;
September 27 edit
Absadi; Adulph & John; Cosmas and Damian;
September 28 edit
Aaron of Auxerre; Achatius the New Martyr; Adalrai of Einsiedeln; Adelphius, Alexander & Zosimus; Eustochium; Wenceslaus I, Duke of Bohemia;
September 29 edit
Gabriel; Michael (archangel); Raphael (archangel); Michael and All Angels;
September 30 edit
Gregory the Illuminator; Saint Honorius; Jerome; Otto of Bamberg; Ursus of Solothurn;