April 1 edit
Abraamios; Abraham of Bulgaria; Agilbert of Paris; Catherine of Palma; Frederick Denison Maurice; Friday of the Confessors; Gilbert de Moravia; Hugh of Grenoble; Ludovic Pavoni; Macarius the Wonderworker; Melito of Sardis; Theodoric; Walric, abbot of Leuconay;
April 2 edit
Abundius; Agape and Theodora; Agapus, Theodorus and Macrobius; Agapius and Theodorus; Agneflete; Aphian; Francis Coll; Francis of Paola; Henry Budd; Leopold of Gaiche; Margaret Clitherow; Mary of Egypt; Nicetius of Lyons; Theodosia;
April 3 edit
Agape and Chionia; Agape, Chionia, and Irene; Agathemerus; Burgundofara; Gandulf of Binasco; John of Penna; Joseph the Hymnographer; New Sunday; Nicetas (abbot); Pancras of Taormina; Richard of Chichester; Pope Sixtus I;
April 4 edit
Agathopodes; Agathopus and Theodulus; Benedict the Moor; Isidore of Seville; Peter, bishop of Poitiers; Saint Plato; Reginald Heber; Tierney of Clones;
April 5 edit
Æthelburg of Kent; Agape, Chionia and Irene; Albert of Montecorvino; Crescentia of Kaufbeuren; Derfel-Gadarn; Emily Ayckbowm; Gerald of Sauve-Majeure; Irene; Juliana of Mount Cornillion; Vincent Ferrer;
April 6 edit
Adam; Adhech; Brychan; Catherine of Pallanza; Pope Celestine I; Elstan of Ramsbury; Patriarch Eutychius of Constantinople; Marcellinus of Carthage; Martyrs of Adiabene; Notker of St Gall; Prudentius of Troyes; Pope Sixtus I; William of Aebelholt; William of Paris;
April 7 edit
Acylina; Adrianus & Jazdinducht; Aedesius; Aedh McCaibre; Aibert; Alexander Rawlins; Apharahat; Saint Celsus; Edward Oldcorne; George the Younger of Mitylene; Goran; Hegesippus (chronicler); Henry Walpole; Herman Joseph; Jean-Baptiste de la Salle; Mary Assunta Pallotta; Nil Sorsky; Ralph Ashley; Ursulina; William of Scicli;
April 8 edit
Agabus; Clement of Osimo; Dionysius, Bishop of Corinth; Julian of St. Augustine; Julie Billiart; Saint Perpetuus; Walter of Pontoise;
April 9 edit
Abdjesus; Achatius of Amida; Aedhach McUa Elich; Aedhan of Cil-Adhain; Anthony Pavoni; Dietrich Bonhoeffer; Gaucherius (saint); Hugh of Champagne; Mary of Clopas; Thomas of Tolentino; Ubald of Florence; Waltrude; William Law;
April 10 edit
Abdicius; Africanus; Africanus, Terentius, Peompejus, Maximus, Zeno, Alexander, Theodorus, Macarius and companions; Anthony Neyrot; Bademus; Fulbert of Chartres; Macarius of Ghent; Mark Fantucci; Martyrs under the Danes; Michael de Sanctis; Paternus of Abdinghof; William Law; William of Ockham;
April 11 edit
Aedh of Echaradh; Agericus of Tours; Barsanuphius of Palestine; Gemma Galgani; George Augustus Selwyn; George Gervase; Godeberta; Saint Guthlac; Helen Guerra; Rabban Hormizd; Isaac of Spoleto; Pope Leo I; Rainerius Inclusus of Osnabruck; Stanislaus of Szczepanów; Waltman;
April 12 edit
Achatius the Younger; Acutina; Agapius, Valerius, Publius, Bassus, Julianus, Felix, Paulus, Maurus, Hertula and Verecunda; Alferius; Andrew of Montereale; Angelo Carletti de Chivasso; Pope Julius I; Sabbas the Goth; Teresa of the Andes; Zeno of Verona;
April 13 edit
Agathodorus and Agathonice; Agathonice; Carpus and Papylus; Edmund Catherick; Guinoch; Hermenegild; Ida of Boulougne, abbess; Ida of Louvain; James of Certaldo; John Lockwood; Margaret of Castello; Pope Martin I; Martius of Clermont;
April 15 edit
Abbo II of Metz; Acuta; Goeric of Metz;
April 16 edit
Abratacus; Adrianus; Agape, Chionia and Irene; Benedict Joseph Labre; Bernadette Soubirous; Fructuosus of Braga; Isabella Gilmore; Magnus Erlendsson, Earl of Orkney; Mary Brant;
April 17 edit
Abdella of Seleucia; Abdhaikla; Achatius II of Melitene; Adrianus; Alexander of Alexandria; Pope Anicetus; Saint Donnan; Robert of Chaise-Dieu; Stephen Harding;
April 18 edit
Abraham of the High Mountain; Pope Agapitus; Marie of the Incarnation;
April 19 edit
Aelfeach; Agathangelus of Esphigmene; Alphege; Expeditus; Pope Leo IX;
April 20 edit
Acindynus; Adalar; Adjutor; Agapitus of Palestrina; Agnes of Montepulciano;
April 21 edit
Abdecalas; Abdecalas of Seleucia; Abdelas; Anselm of Canterbury; Beuno; Januarius; Simeon Barsabba'e; Conrad of Parzham;
April 22 edit
Abdjesu; Abdjesus the Bishop; Abel McAedh; Abrosima; Acepsima; Acepsimas of Hnaita, Joseph of Bet-Katoba, and Aithalas of Bet-Nuhadra; Adalbert of Ostravant; Pope Agapetus I; Aldebert of Ostrevant; Aprunculus of Treves; Mar Bacus; Pope Caius; Pherbutha; Mar Sargis; Pope Soter; Theodore of Sykeon;
April 23 edit
Achilles; Achilleus; Adalbert of Prague; Aegydius of Tyre; Aegydius of Assisi; Saint George; Voitech of Prague;
April 24 edit
Mar Addai; Egbert of Northumbria; George the Martyr; Ivo of Huntingdonshire; Martyrs of the Twentieth Century; Mary Euphrasia Pelletier; Mellitus;
April 25 edit
Adurhormizd; Dadjesus; Mark the Evangelist; William of Montevergine;
April 26 edit
Pope Anacletus; Pope Marcellinus; Radbertus; Stephen of Perm;
April 27 edit
Adelinus; Adrianus & Felicianus; Alleaume; Christina Rossetti; Maughold; Petrus Canisius; Turibius of Mongrovejo; Zita;
April 28 edit
Achatius; Addaeus; Addai; Adelphius of Metz; Africanus of Comminges; Agape; Agapus; Louis de Montfort; Paul of the Cross; Peter Chanel;
April 29 edit
Achatius of Jerusalem; Aemilianus; Agapius; Agapius of Novarra; Agapius and Secundinus; Catherine of Siena; Giuseppe Benedetto Cottolengo; Hugh of Cluny; Robert of Molesme;
April 30 edit
Agapius; Catherine of Siena; Erconwald; James, son of Zebedee; Marianus and James; Marie of the Incarnation; Pandita Ramabai; Pope Pius V;