Day | Saints | Country | Year |
| March 21 |
| Saint Benedict of Norcia (Benedetto da Norcia), abbot |  Italy | 547 |
| Saint Jean de Valence, bishop |  France | 1146 |
| Saint Nicholas of Flüe (Niklaus von Flüe), religious |  Switzerland | 1487 |
| Blessed Thomas Pilcher, priest |  England | 1587 |
| Blessed Matthew Flathers, priest | England | 1608 |
| Saint Benedetta Cambiagio Frassinello, religious | Italy | 1858 |
| Blessed Miguel Gómez Loza, layperson |  Mexico | 1928 |
| March 22 |
| Saint Lea di Roma, layperson | Italy | 384 |
| Saint Benvenuto degli Scottivoli, bishop | Italy | 1283 |
| Blessed François Chartier, priest | France | 1794 |
| Blessed Bronisław Komorowski, priest |  Poland | 1940 |
| Blessed Marian Górecki, priest | Poland | 1940 |
| Blessed Clemens August von Galen, cardinal |  Germany | 1946 |
| March 23 |
| Saint Nico di Taormina, bishop | Italy | 273 |
| Saint Ottone Frangipane, religious | Italy | 1127 |
| Blessed Edmund Sykes, priest | England | 1587 |
| Saint Turibius of Mongrovejo (Toribio Alfonso de Mogrovejo), archbishop |  Peru | 1606 |
| Blessed Peter Higgins (Peadar Ó Huiggin), priest |  Ireland | 1642 |
| Saint José Oriol, priest |  Spain | 1702 |
| Blessed Annunciata Astoria Cocchetti, religious | Italy | 1882 |
| Saint Rafqa (Pietra Choboq Ar-Rayès), religious |  Lebanon | 1914 |
| Blessed Metod (Dominik Trčka), priest |  Slovakia | 1959 |
| Blessed Álvaro del Portillo y Álvaro, bishop | Italy | 1994 |
| March 24 |
| Saint Ireneus of Sirmium, bishop |  Serbia | 304 |
| Saint Macartan of Clogher, bishop | Ireland | 506 |
| Blessed Giovanni del Bastone, priest | Italy | 1290 |
| Saint Catherine of Vadstena (Katarina av Vadstena), religious |  Sweden | 1381 |
| Blessed Diego José da Cadice (Francisco José López-Caamaño García-Pérez), priest | Spain | 1801 |
| Blessed Maria Serafina del Sacro Cuore (Clotilde Micheli), religious | Italy | 1911 |
| Blessed Maria od Jezusa Ukrzyżowanego (Maria Karłowska), religious | Poland | 1935 |
| Blessed Antoni Ulma, layperson | Poland | 1944 |
| Blessed Barbara Ulma, layperson | Poland | 1944 |
| Blessed Franciszek Ulma, layperson | Poland | 1944 |
| Blessed Józef Ulma, layperson | Poland | 1944 |
| Blessed Maria Ulma, layperson | Poland | 1944 |
| Blessed Stanisława Ulma, layperson | Poland | 1944 |
| Blessed Ulma, layperson | Poland | 1944 |
| Blessed Wiktoria Ulma, layperson | Poland | 1944 |
| Blessed Władysław Ulma, layperson | Poland | 1944 |
| Blessed Maria Adelheidis (Jadwiga Töpfer), religious | Poland | 1945 |
| Blessed Maria Felicitas (Anna Ellmerer), religious | Poland | 1945 |
| Blessed Maria Melusja (Marta Rybka), religious | Poland | 1945 |
| Blessed Maria Sapientia (Łuczja Heymann), religious | Poland | 1945 |
| Saint Óscar Arnulfo Romero y Galdámez, archbishop |  El Salvador | 1980 |
| March 25 |
| Saint Humbert de Maroilles, bishop | France | 680 |
| Saint Zachary, pope |  Greece | 752 |
| Saint Nicodemo di Mammola, religious | Italy | 990 |
| Saint Procopius of Sázava, abbot |  Czechia | 1053 |
| Blessed Eberhard von Nellemburg, religious | Switzerland | 1078 |
| Blessed Tommaso da Costacciaro, religious | Italy | 1337 |
| Saint Margaret Clitherow, layperson | England | 1586 |
| Blessed James Bird, layperson | England | 1592 |
| Saint Lucia Filippini, religious | Italy | 1732 |
| Blessed Maria Rosa (Margherita Flesch), religious | Germany | 1906 |
| Blessed Camille Costa de Beauregard, priest | France | 1910 |
| Blessed Placido (Tommaso Riccardi), priest | Italy | 1915 |
| Blessed Yosafata (Mykhailyna Hordashevs’ka / Михайлина Йосафа́та Гордашевська), religious |  Ukraine | 1919 |
| Saint Marie-Alphonsine Danil (Soultaneh Maria Ghaţţas), religious |  Israel | 1927 |
| Blessed Omeljan Kovč (Омеля́н Ковч), priest | Poland | 1944 |
| Blessed Hilary (Paweł Januszewski), priest | Germany | 1945 |
| Blessed Ndre Zadeja, priest |  Albania | 1945 |
| Blessed János Scheffler, bishop |  Romania | 1952 |
| March 26 |
| Saint Peter of Sebaste, archbishop |  Turkiye | 391 |
| Saint Liudger, bishop | Germany | 809 |
| Blessed Paulus Oh Ban-ji (오반지 바오로 / 吳盤池), layperson |  South Korea | 1866 |
| Blessed Maddalena Caterina Morano, religious | Italy | 1908 |
| March 27 |
| Saint Rupert von Salzburg, bishop |  Austria | 718 |
| Blessed Petrus Jo Yong-sam (조용삼 베드로), layperson | South Korea | 1801 |
| Blessed Louis-Édouard Cestac, priest | France | 1868 |
| Blessed Francesco Faà di Bruno, priest | Italy | 1888 |
| Blessed Marie-Eugène de l’Enfant-Jésus (Henri Grialou), priest | France | 1967 |
| Blessed Giuseppe Ambrosoli, priest |  Uganda | 1987 |
| March 28 |
| Saint Gontran, layperson | France | 592 |
| Saint Stephen Harding, abbot | France | 1134 |
| Saint Cono di Naso, abbot | Italy | 1236 |
| Blessed Jeanne-Marie de Maillé, religious | France | 1414 |
| Blessed Christopher Wharton, priest | England | 1600 |
| Blessed Renée-Marie Feillatreau épouse Dumont, layperson | France | 1794 |
| Saint Józef Sebastian Pelczar, bishop | Poland | 1924 |
| Blessed Dedë Maçaj, priest | Albania | 1947 |
| Blessed Jean-Baptiste Malo, priest |  Vietnam | 1954 |
| March 29 |
| Saint Achard de Saint-Victor, bishop | France | 1171 |
| Saint Berthold, priest | Israel | 1195 |
| Saint Guillaume Tempier, bishop | France | 1197 |
| Saint Ludolf, bishop | Germany | 1250 |
| Blessed John Hambley, priest | England | 1587 |
| March 30 |
| Saint Quirino di Neuss, layperson | Italy | 116 |
| Saint Secondo d’Asti, layperson | Italy | 119 |
| Saint Pietro Regalado, religious | Spain | 1456 |
| Blessed Amédée IX de Savoie, layperson | Italy | 1472 |
| Saint Antoine-Marie-Nicolas Daveluy (다블뤼 안토니오 / 安敦伊), bishop | South Korea | 1866 |
| Saint Iosephus Chang Chu-gi (장주기 요셉 / 張周基), layperson | South Korea | 1866 |
| Saint Lucas Hwang Sŏk-tu (황석두 루가 / 黃錫斗), layperson | South Korea | 1866 |
| Saint Martin-Luc Huin (위앵 루카 / 閔神父), priest | South Korea | 1866 |
| Saint Pierre Aumaître (오매뜨르 베드로 / 吳神父), priest | South Korea | 1866 |
| Saint Ludovico da Casoria (Arcangelo Palmentieri), priest | Italy | 1885 |
| Saint Leonardo Murialdo, priest | Italy | 1900 |
| Saint Julio Álvarez Mendoza, priest | Mexico | 1927 |
| Blessed Maria Restituta (Helena Kafka), religious | Austria | 1943 |
| March 31 |
| Saint Giusta di Bazzano, layperson | Italy | 286 |
| Saint Guido di Pomposa, abbot | Italy | 1046 |
| Blessed Bonaventura da Forlì Tornielli, priest | Italy | 1491 |
| Blessed Marcus Sin Seok-bok (신석복 마르코 / 申錫福), layperson | South Korea | 1866 |
| Blessed Natalia Tułasiewicz, layperson | Germany | 1945 |
