Day | Saints | Country | Year |
| May 1 |
| Saint Ippolisto, layperson |  Italy | 303 |
| Saint Judas Cyriacus (Ciriaco di Gerusalemme), bishop | Italy | 363 |
| Saint Brieuc, bishop |  France | 502 |
| Saint Asaph, bishop |  Wales | 596 |
| Saint Arey de Gap, bishop | France | 604 |
| Saint Théodard de Narbonne, archbishop | France | 893 |
| Saint Wiborada von Sankt Gallen, religious |  Switzerland | 926 |
| Blessed Mafalda de Portugal, religious |  Portugal | 1256 |
| Saint Vivaldo da San Gimignano (Vivaldo Stricchi), religious | Italy | 1320 |
| Saint Pellegrino Laziosi, religious | Italy | 1345 |
| Blessed Julijan iz Bala Cesarello, priest |  Croatia | 1349 |
| Saint Pius V, pope | Italy | 1572 |
| Saint Augustin Schoeffler, priest |  Vietnam | 1851 |
| Saint Jean-Louis Bonnard, priest | Vietnam | 1852 |
| Saint Richard (Erminio Filippo Pampuri), religious | Italy | 1930 |
| Blessed Maria Bona (Anna Pestka), religious |  Poland | 1945 |
| Blessed Klymentii (Maria Kazymyr Sheptyts’kyi / Марiя Казимир Климентій Шептицький), priest |  Russia | 1951 |
| May 2 |
| Saint Athanasius of Alexandria, bishop |  Egypt | 373 |
| Saint Valbert de Luxeuil, abbot | France | 670 |
| Saint Antonino Pierozzi, archbishop | Italy | 1459 |
| Blessed William Tirry (Liam Tuiridh), priest |  Ireland | 1654 |
| Saint Giuse Nguyễn Văn Lựu, layperson | Vietnam | 1854 |
| Saint José María Rubio y Peralta, priest |  Spain | 1929 |
| Blessed Bolesław Strzelecki, priest | Poland | 1941 |
| Blessed Maria Acutina (Helena Goldberg), religious | Poland | 1945 |
| Blessed Sandra Sabattini, layperson | Italy | 1984 |
| May 3 |
| Saint Ansfried, bishop |  Netherlands | 1010 |
| Saint Theodosius of Pečerska, abbot |  Ukraine | 1074 |
| Saint Ricovero (Uguccione da Firenze), priest | Italy | 1282 |
| Blessed Emilia Bicchieri, religious | Italy | 1314 |
| Saint Stanisław Kazimierczyk, priest | Poland | 1489 |
| Blessed Juana de la Cruz (Juana Vázquez y Gutiérrez), religious | Spain | 1534 |
| Blessed Tommaso da Olera (Tommaso Acerbis), religious |  Austria | 1631 |
| Blessed Estephan El Douaihy, patriarch |  Lebanon | 1704 |
| Blessed Edoardo Giuseppe Rosaz, bishop | Italy | 1903 |
| Saint Marie-Léonie (Alodie-Virginie Paradis), religious |  Canada | 1912 |
| Blessed Ramón Oromí Sullà, priest | Spain | 1937 |
| May 4 |
| Saint Conleth of Kildare, bishop | Ireland | 519 |
| Saint Willerich, bishop |  Germany | 837 |
| Blessed Michał Giedrojć, religious | Poland | 1485 |
| Blessed Władysław z Gielniowa, priest | Poland | 1505 |
| Saint Augustine Webster, priest |  England | 1535 |
| Blessed John Haile, priest | England | 1535 |
| Saint John Houghton, priest | England | 1535 |
| Saint Richard Reynolds, priest | England | 1535 |
| Saint Robert Lawrence, priest | England | 1535 |
| Blessed Jean-Martin Moyë (梅慕雅), priest | France | 1793 |
| Blessed Victor Emilio Moscoso Cárdenas, priest |  Ecuador | 1897 |
| Blessed Józef Czempiel, priest | Poland | 1942 |
| May 5 |
| Saint Hilaire d’Arles, archbishop | France | 449 |
| Saint Mauront de Marchiennes, abbot | France | 701 |
| Saint Maurand de Douai, deacon | France | 702 |
| Saint Gottardo, bishop | Germany | 1038 |
| Saint Angelo da Gerusalemme, priest | Italy | 1225 |
| Blessed Benvenuto Mareni da Recanati, religious | Italy | 1269 |
| Saint Nunzio Sulprizio, layperson | Italy | 1836 |
| Blessed Caterina Cittadini, religious | Italy | 1857 |
| Blessed Grzegorz (Bolesław Frąckowiak), religious | Germany | 1943 |
| Blessed Jean Mestre, layperson | France | 1944 |
| May 6 |
| Saint Peter Nolasco (Pierre Nolasque), religious | Spain | 1256 |
| Blessed Bartolomeo Pucci-Franceschi, priest | Italy | 1330 |
| Blessed Anthony Middleton, priest | England | 1590 |
| Blessed Edward Jones, priest | England | 1590 |
| Saint François de Laval de Montmorency, bishop | Canada | 1708 |
| Blessed Jacinto Vera y Durán, bishop |  Uruguay | 1881 |
| Blessed Maria Caterina di Santa Rosa da Viterbo (Costanza Troiani), religious | Egypt | 1887 |
| Blessed Anna Rosa (Rosa Maria Benedetta Gattorno Custo), religious | Italy | 1900 |
| Blessed Henryk Kaczorowski, priest | Poland | 1942 |
| Blessed Kazimierz Witold Gostyński, priest | Poland | 1942 |
| Blessed Marcel Carrier, layperson | France | 1945 |
| May 7 |
| Saint Domitilla, layperson | Italy | 95 |
| Saint John of Beverley, bishop | England | 721 |
| Blessed Gisela of Hungary (Gizella), layperson |  Hungary | 1065 |
| Blessed Alberto di Villa d’Ogna, layperson | Italy | 1279 |
| Saint Rosa Venerini, religious | Italy | 1728 |
| Saint Agostino Roscelli, priest | Italy | 1902 |
| Blessed Francesco Paleari, priest | Italy | 1939 |
| May 8 |
| Saint Agathius (Acacius of Byzantium), layperson |  Turkiye | 303 |
| Saint Boniface IV, pope | Italy | 615 |
| Saint Benedict II, pope | Italy | 685 |
| Saint Litifredo, bishop | Italy | 874 |
| Saint Amato Ronconi, layperson | Italy | 1292 |
| Blessed Luigi Rabatà, priest | Italy | 1490 |
| Blessed Marie-Catherine de Saint-Augustin (Catherine de Simon de Longpré), religious | Canada | 1668 |
| Blessed Clara van het arme Kind Jezus (Clara Fey), religious | Netherlands | 1894 |
| Blessed Ulrika (Franziska Nisch), religious | Germany | 1913 |
| Blessed Miriam Teresa Demjanovich, religious |  USA | 1927 |
| Blessed Antonin (Jan Eugeniusz Bajewski), priest | Poland | 1941 |
| Blessed Jean Batiffol, priest | France | 1945 |
| Blessed Henri Vergès, religious |  Algeria | 1994 |
| Blessed Paul-Hélène Saint Raymond, religious | Algeria | 1994 |
| May 9 |
| Saint Constantine of Dumnonia, layperson | England | 576 |
| Saint Adalgar, archbishop | Germany | 909 |
| Blessed Forte Gabrielli, religious | Italy | 1040 |
| Saint Gregorio Ostiense, cardinal | Italy | 1044 |
| Blessed Benincasa da Montepulciano, religious | Italy | 1426 |
| Blessed Niccola Albergati, cardinal | Italy | 1443 |
| Blessed Thomas Pickering, religious | England | 1679 |
| Saint Giuse Hiên, priest | Vietnam | 1840 |
| Blessed Maria Theresia von Jesus (Karolina Gerhardinger), religious | Germany | 1879 |
| Blessed Alexandru Rusu, bishop |  Romania | 1963 |
| Saint María Carmen (Carmen Elena Rendíles Martínez), religious |  Venezuela | 1977 |
| May 10 |
| Saint Alphius, layperson | Italy | 253 |
| Saint Cyrinus, layperson | Italy | 253 |
| Saint Philadelphus, layperson | Italy | 253 |
| Blessed Beatrice d’Este, religious | Italy | 1226 |
| Saint John of Avila (Juan de Ávila), priest | Spain | 1569 |
| Blessed Ivan Merz, layperson | Croatia | 1928 |
| Blessed Enrico Rebuschini, priest | Italy | 1938 |
| Blessed Vasile Aftenie, bishop | Romania | 1950 |
