October 1 edit
Abai (martyr); Abhai the general; Abiathar and Sidonia; Abreha & Atzbeha; Ezana of Axum; Gregory the Illuminator; Mar Khnana; Saint Remigius; Romanos; Saizana;
October 2 edit
Admonius;
October 3 edit
Abd-al-Masih (martyr); Abda; Abdalmasih; Adalgisus of Novara; Adalgott of Chur; Agapita; Aldegisus of Novara; Algot of Chur; Aser; Denis; Thérèse de Lisieux; Thomas de Cantilupe;
October 4 edit
Acepsimas, Leo & Isidore; Adauctus & Callisthene; Francis of Assisi;
October 5 edit
Agatho;
October 6 edit
Adalbero of Wurzburg; Aemilius; Aeschil; Bruno of Cologne;
October 7 edit
Our Lady of the Rosary
October 8 edit
Aetherius of Lyons; Agatho; Alermius; Bridget of Sweden; Demetrius of Alexandria; Etherius;
October 9 edit
Abraham; Adalbero of Augsburg; Adrianus & Dionysius; Denis; John Leonardi; Louis Bertrand (saint);
October 10 edit
Francis Borgia; Paulinus of York;
October 11 edit
Agilbert of Paris; Aglibert of Paris; Archbishop Atticus of Constantinople; Bruno of Cologne; Archbishop Nectarius of Constantinople;
October 12 edit
Aedistus of Ravenna; Edistius; Martyrs of Africa; Wilfrid;
October 13 edit
Adrias; Agatho of Alexandria; Agathodorus; Edward the Confessor;
October 14 edit
Agrates of Vienna; Agricius of Vienne; Pope Calixtus I; Cosmas and Damian; Mar Elia the Tishbite;
October 15 edit
Agileus; Agleus; Lucian of Antioch; Teresa of Avila; Theophilus of Alexandria;
October 16 edit
Agapitus; Saint Gall; Longinus (hagiography); Margaret Mary Alacoque; Martyrs of Africa;
October 17 edit
Æthelthryth; Ignatius of Antioch; John Colobos; Margaret Mary Alacoque; Nothelm; Theophilus of Alexandria;
October 18 edit
Addaeus; Addai; Agnes; Luke the Evangelist
October 19 edit
Aaron (Saint); Abselema of Edessa; Frideswide; Paul of the Cross; Peter of Alcantara;
October 20 edit
Acca of Hexham; Adalbert of Prague; Adelina; Aderald; Agricola; Voitech of Prague;
October 21 edit
Aetherius; Afriges, Macarius, Dicus, Proculus and companions; Afrina; Hilarion; Saint Ursula;
October 22 edit
Aaron the Illustrious; Abercius of Hieropolis; Abib and Apollo; Aderald; Adorator; Adrianus; Adrianus, Innocentus, John Paul II, Ursus, Rosatus, Felix, Sisinnius, Exuberantius & Flora; Adrier; Oradour;
October 23 edit
Aaron the Illustrious; Abercius of Hierapolis; Ignatius of Constantinople; James the Just; Giovanni da Capistrano
October 24 edit
Abraham the Great of Kidunja; Achatius; Adauctus; Proclus of Constantinople; Raphael (archangel);
October 25 edit
Crispin;
October 26 edit
Adalgott of Einsiedeln; Aemilianus; Afra; Alfred the Great; Chad of Mercia; Demetrius of Alexandria; Pope Evaristus; Martyrs of Agen;
October 27 edit
Abban of Kill-Abban; Abban of Magheranoidhe; Abraham the Poor; Adelelmus of Estival; Agapitus and companions; Firmilian; Frumentius;
October 28 edit
Abdias of Babylon; Abgar V of Edessa; Aemilianus & Valentinus; Africanus, Terentius, Peompejus, Maximus, Zeno, Alexander, Theodorus, Macarius and companions; Jude Thaddeus; Simon the Zealot; Simon and Jude, Apostles;
October 29 edit
October 30 edit
Achillas of Alexandria; Addaeus; Addai; Agentus; Martyrs of Africa; Mar Youkhanan Tayaya;
October 31 edit
Abaidas; Beginning of Rogation of St. George the Martyr; Reformation Day (Lutheran)