Day | Saints | Country | Year |
| May 21 |
| Saint Hospice de Nice, religious |  France | 581 |
| Saint Godric of Finchale, religious |  England | 1170 |
| Saint Pietro Parenzo, layperson |  Italy | 1199 |
| Saint Hemming, bishop |  Finland | 1366 |
| Blessed Léon (Jean Mopinot), religious | France | 1794 |
| Saint Eugène (Charles-Joseph-Eugène de Mazenod), archbishop | France | 1861 |
| Blessed Adilio Daronch, layperson |  Brazil | 1924 |
| Blessed Emmanuel Gómez González, priest | Brazil | 1924 |
| Blessed Bruno (Christian Lemarchand), priest |  Algeria | 1996 |
| Blessed Célestin Ringeard, priest | Algeria | 1996 |
| Blessed Christian de Chergé, priest | Algeria | 1996 |
| Blessed Christophe Lebreton, priest | Algeria | 1996 |
| Blessed Luc (Paul Dochier), religious | Algeria | 1996 |
| Blessed Michel Fleury, religious | Algeria | 1996 |
| Blessed Paul Favre-Miville, religious | Algeria | 1996 |
| May 22 |
| Saint Constantine, layperson |  Turkiye | 337 |
| Saint Quitterie, layperson | France | 472 |
| Saint Bevons de Voghera, layperson | France | 986 |
| Saint Giovanni da Parma, abbot | Italy | 990 |
| Saint Umiltà (Rosanna Negusanti), religious | Italy | 1310 |
| Saint Rita of Cascia (Rita da Cascia / Margherita Lotti), religious | Italy | 1457 |
| Blessed John Forest, priest | England | 1538 |
| Blessed João Baptista Machado de Távora (ジョアン･バプティスタ･マチャード･デ･タボラ), priest |  Japan | 1617 |
| Blessed Pedro de la Asunción (ペドロ･デ･ラ･アスンシオン), priest | Japan | 1617 |
| Saint Micae Hô Ðình Hy, layperson |  Vietnam | 1857 |
| Saint Laurensô Phạm Viết Ngôn, layperson | Vietnam | 1862 |
| Blessed Maria Domenica Brun Barbantini, religious | Italy | 1868 |
| Blessed Francisco Salinas Sánchez, layperson |  Spain | 1938 |
| Blessed José Quintas Duran, layperson | Spain | 1938 |
| May 23 |
| Saint Urban I, pope | Italy | 230 |
| Saint Mercuriale, bishop | Italy | 405 |
| Saint Guibert de Gembloux, religious |  Belgium | 962 |
| Saint William of Perth, layperson | England | 1201 |
| Saint Giovanni Battista de’ Rossi, priest | Italy | 1764 |
| Blessed Maria Crocifissa del Divino Amore (Maria Gargani), religious | Italy | 1973 |
| May 24 |
| Saint Servolo, layperson | Italy | 284 |
| Saint Simeon Stylites the Younger, religious | Turkiye | 592 |
| Blessed Lanfranc, archbishop | England | 1089 |
| Blessed Filippo da Piacenza, priest | Italy | 1306 |
| Blessed Juan de Prado, priest |  Morocco | 1631 |
| Saint Agatha Kim A-gi (김아기 아가타 / 金阿只), layperson |  South Korea | 1839 |
| Saint Agatha Yi So-sa (이소사 아가타 / 李召史), layperson | South Korea | 1839 |
| Saint Anna Pak A-gi (박아기 안나 / 朴阿只), layperson | South Korea | 1839 |
| Saint Augustinus Yi Kwang-hŏn (이광헌 아우구스티노 / 李光獻), layperson | South Korea | 1839 |
| Saint Barbara Han A-gi (한아기 바르바라 / 韓阿只), layperson | South Korea | 1839 |
| Saint Damianus Nam Myŏng-hyŏk (남명혁 다미아노 / 南明赫), layperson | South Korea | 1839 |
| Saint Lucia Pak Hŭi-sun (박희순 루치아 / 朴喜順), layperson | South Korea | 1839 |
| Saint Magdalena Kim Ŏb-i (김업이 막달레나 / 金業伊), layperson | South Korea | 1839 |
| Saint Petrus Kwŏn Tŭg-in (권득인 베드로 / 權得仁), layperson | South Korea | 1839 |
| Blessed Louis-Zéphirin Moreau, bishop |  Canada | 1901 |
| Blessed Józef Kurzawa, priest |  Poland | 1940 |
| Blessed Wincenty Matuszewski, priest | Poland | 1940 |
| Blessed Isidore Ngei Ko Lat (ငယ္ကိုလတ္), layperson |  Myanmar | 1950 |
| Blessed Mario Vergara, priest | Myanmar | 1950 |
| May 25 |
| Saint Aldhelm of Sherborne, bishop | England | 709 |
| Saint Gregory VII, pope | Italy | 1085 |
| Blessed Giacomo Filippo (Andrea Bertoni), priest | Italy | 1483 |
| Saint Maria Maddalena (Caterina de’ Pazzi), religious | Italy | 1607 |
| Saint Pherô Ðoàn Văn Vân, layperson | Vietnam | 1857 |
| Saint Maddalena Sofia Barat, religious | France | 1865 |
| Saint Dionysius Ssebuggwawo Wasswa (Denis), layperson |  Uganda | 1886 |
| Saint Agustín Caloca Cortés, priest |  Mexico | 1927 |
| Saint Cristóbal Magallanes Jara, priest | Mexico | 1927 |
| Blessed Mykola Tsehel’s’kyi (Микола Цегельський), priest |  Russia | 1951 |
| May 26 |
| Saint Augustine of Canterbury, archbishop | England | 604 |
| Saint Gond, religious | France | 690 |
| Saint Bede the Venerable (Bede), priest | England | 735 |
| Blessed Francesco Patrizi, priest | Italy | 1328 |
| Blessed Andrea Franchi, bishop | Italy | 1401 |
| Saint Philip Neri (Filippo de Neri), priest | Italy | 1595 |
| Saint Mariana de Jesús (Mariana de Paredes y Flores), religious |  Ecuador | 1645 |
| Saint Pedro Sans i Jordà (桑實), bishop |  China | 1747 |
| Blessed Andreas Kim Sa-geon (김사건 안드레아 / 金思健), layperson | South Korea | 1839 |
| Blessed Andreas Pak Sa-ui (박사의 안드레아 / 朴士儀), layperson | South Korea | 1839 |
| Blessed Andreas Yi Jae-haeng (이재행 안드레아 / 李在行), layperson | South Korea | 1839 |
| Saint Gioan Ðoàn Trinh Hoan, priest | Vietnam | 1861 |
| Saint Matthêô Nguyễn Văn Đắc (Phượng), layperson | Vietnam | 1861 |
| Blessed Frézal (Jean-Pierre-Eugène Tardieu), priest | France | 1871 |
| Blessed Ladislas (Armand Radigue), priest | France | 1871 |
| Blessed Marcellin (Jean-Marie Rouchouze), priest | France | 1871 |
| Blessed Mathieu-Henri Planchat, priest | France | 1871 |
| Blessed Polycarpe (Jules Tuffier), priest | France | 1871 |
| Saint Andreas Kaggwa (Anderea), layperson | Uganda | 1886 |
| Saint Pontianus Ngondwe (Ponsiano), layperson | Uganda | 1886 |
| May 27 |
| Saint Bruno di Carinzia, bishop |  Germany | 1045 |
| Saint Gausbert de Montsalvy, abbot | France | 1079 |
| Blessed Margaret Pole, layperson | England | 1541 |
| Blessed Edmund Duke, priest | England | 1590 |
| Blessed John Hogg, priest | England | 1590 |
| Blessed Richard Hill, priest | England | 1590 |
| Blessed Richard Holiday, priest | England | 1590 |
| Blessed Matthias (マチアス), layperson | Japan | 1620 |
| Saint Barbara Kim (김 바르바라 / 金巴巴拉), layperson | South Korea | 1839 |
| Saint Barbara Yi (이 바르바라 / 李巴巴拉), layperson | South Korea | 1839 |
| Saint Iosephus Chang Sŏng-jib (장성집 요셉 / 張若瑟), layperson | South Korea | 1839 |
| Saint Athanasius Bazzekuketta (Antanansio), layperson | Uganda | 1886 |
| Saint Gonzaga Gonza, layperson | Uganda | 1886 |
| Blessed Sixto Alonso Hevia, layperson | Spain | 1937 |
| Blessed Mariantonia Samà, layperson | Italy | 1953 |
| May 28 |
| Saint Germain de Paris, bishop | France | 576 |
| Saint Anastasio di Pavia, bishop | Italy | 680 |
| Saint Podio di Firenze, bishop | Italy | 1002 |
| Saint Ubaldesca Taccini, religious | Italy | 1205 |
| Blessed Maria Bartolomea Bagnesi, layperson | Italy | 1577 |
| Blessed John Shert, priest | England | 1582 |
| Blessed Robert Johnson, priest | England | 1582 |
| Blessed Thomas Ford, priest | England | 1582 |
| Saint Phaolô Hạnh, layperson | Vietnam | 1859 |
| Blessed Luis Berenguer Moratonas, priest | Spain | 1937 |
| Blessed Władysław Demski, priest | Germany | 1940 |
| Blessed Antoni Julian Nowowiejski, archbishop | Poland | 1941 |
| Blessed Maria Costanza (Agnese Pacifica Panas), abbess | Italy | 1963 |
| Blessed Iuliu Hossu, bishop |  Romania | 1970 |
| Blessed Stefan Wyszyński, cardinal | Poland | 1981 |
| May 29 |
| Saint Alessandro, layperson | Italy | 397 |
| Saint Martirio, layperson | Italy | 397 |
| Saint Sisinnio, deacon | Italy | 397 |
| Saint Bona di Pisa, layperson | Italy | 1207 |
| Blessed Aymard, religious | France | 1242 |
| Blessed Bernard da Roquefort, priest | France | 1242 |
| Blessed Bernardo, religious | France | 1242 |
| Blessed Étienne de Saint-Thibéry, priest | France | 1242 |
| Blessed Fortanier, religious | France | 1242 |
| Blessed Garsias d’Aure, religious | France | 1242 |
| Blessed Guillaume Arnaud, priest | France | 1242 |
| Blessed N., priest | France | 1242 |
| Blessed Pierre Arnaud, layperson | France | 1242 |
| Blessed Raymond Carbonnier, priest | France | 1242 |
| Blessed Raymond Escriban, priest | France | 1242 |
| Blessed Richard Thirkeld, priest | England | 1583 |
| Blessed Iob Yi Il-eon (이일언 욥 / 李日彦), layperson | South Korea | 1839 |
| Blessed Paulus Jeong Tae-bong (정태봉 바오로 / 鄭太奉), layperson | South Korea | 1839 |
| Blessed Petrus Kim Dae-gwon (김대권 베드로 / 金大權), layperson | South Korea | 1839 |
| Blessed Petrus Sin Tae-bo (신태보 베드로 / 申太甫), layperson | South Korea | 1839 |
| Blessed Petrus Yi Tae-gwon (이태권 베드로 / 李太權), layperson | South Korea | 1839 |
| Blessed Joseph Gérard, priest |  Lesotho | 1914 |
| Saint Maria Ursula of Jesus (Julia Ledóchowska), religious | Italy | 1939 |
| May 30 |
| Saint Emmelia of Caesarea, layperson | Turkiye | 373 |
| Saint Hubert de Liège, bishop | Belgium | 727 |
| Saint Ferdinand III of Castile (Fernando III de Castilla), layperson | Spain | 1252 |
| Saint Joan of Arc (Jeanne d’Arc), layperson | France | 1431 |
| Blessed Laurence Richardson, priest | England | 1582 |
| Saint Luke Kirby, priest | England | 1582 |
| Blessed Thomas Cottam, priest | England | 1582 |
| Blessed William Filby, priest | England | 1582 |
| Blessed Richard Newport (Smith), priest | England | 1612 |
| Blessed William Scott, priest | England | 1612 |
| Saint Matthias Kalemba Mulumba Wante (Matiya), layperson | Uganda | 1886 |
| Saint Joseph Marello (Giuseppe Marello), bishop | Italy | 1895 |
| Blessed Marie-Céline de la Présentation (Jeanne-Germaine Castang), religious | France | 1897 |
| Blessed Maria (Marta Anna Wiecka), religious |  Ukraine | 1904 |
| Blessed Otto Neururer, priest | Germany | 1940 |
| May 31 |
| Saint Gaudenzio di Ossero, bishop |  Croatia | 1044 |
| Blessed Giacomo Salomoni, priest | Italy | 1314 |
| Saint Vitale d’Assisi, religious | Italy | 1370 |
| Saint Battista (Camilla da Varano), abbess | Italy | 1524 |
| Blessed Robert Thorpe, priest | England | 1591 |
| Blessed Thomas Watkinson, layperson | England | 1591 |
| Blessed Nicholas Barré, priest | France | 1686 |
| Saint Felix of Nicosia (Felice di Nicosia / Filippo Giacomo Amoroso), religious | Italy | 1787 |
| Blessed Iacobus Chu Mun-mo (Zhou Wenmo) (주문모 야고보 / 周文謨), priest | South Korea | 1801 |
| Blessed Mariano da Roccacasale (Domenico Di Nicolantonio), religious | Italy | 1866 |
| Saint Noë Mawaggali (Nowa), layperson | Uganda | 1886 |
| Blessed Juan Moya Collado, layperson | Spain | 1938 |
