Day | Saints | Country | Year |
| December 1 |
| Saint Ansano di Siena, layperson |  Italy | 304 |
| Saint Éloi de Noyon, bishop |  Belgium | 660 |
| Blessed Hughes, cardinal |  France | 1158 |
| Blessed Giovanni Gueruli da Verucchio, deacon | Italy | 1320 |
| Blessed Antonio Bonfadini, priest | Italy | 1482 |
| Blessed John Beche, priest |  England | 1539 |
| Saint Alexander Briant, priest | England | 1581 |
| Saint Edmund Campion, priest | England | 1581 |
| Saint Ralph Sherwin, priest | England | 1581 |
| Blessed Richard Langley, layperson | England | 1586 |
| Blessed Pius Kim Jin-hu (김진후 비오 / 金震厚), layperson |  South Korea | 1814 |
| Blessed Maria Clara do Menino Jesus (Libânia do Carmo Galvão Mexia de Moura Telles e Albuquerque), religious |  Portugal | 1899 |
| Saint Charles de Jésus (Charles Eugène de Foucauld), priest |  Algeria | 1916 |
| Blessed Pedro Pascual García Martín, priest |  Spain | 1936 |
| Blessed Maria Clementina (Alphonsine Anuarite Nengapeta), religious |  Congo-Kinshasa | 1964 |
| Blessed Maria Rosa di Gesù (Bruna Pellesi), religious | Italy | 1972 |
| December 2 |
| Blessed Jan van Ruusbroec, priest | Belgium | 1381 |
| Blessed María Ángela (Jerónima María Astorch Cortey), religious | Spain | 1665 |
| Blessed Raffaele (Melchor Chyliński), priest |  Poland | 1741 |
| Blessed Agapio (José Luis Carrera Comas), religious | Spain | 1936 |
| Blessed Liduina (Elisa Angela Meneguzzi), religious |  Ethiopia | 1941 |
| Blessed Bernardin (Zef Palaj), priest |  Albania | 1947 |
| Blessed Ivan Sleziuk (Іван Слезюк), bishop |  Ukraine | 1973 |
| December 3 |
| Saint Cassian of Tangier, layperson |  Morocco | 298 |
| Saint Birinus of Dorchester, bishop | England | 649 |
| Saint Sola, priest |  Germany | 794 |
| Saint Osmund of Salisbury, bishop | England | 1099 |
| Saint Galgano Guidotti, religious | Italy | 1181 |
| Saint Francis Xavier (Francisco Xavier / 方濟．沙勿略), priest |  China | 1552 |
| Blessed Edward Coleman, layperson | England | 1678 |
| Blessed Ambrosius Kim Se-bak (김세박 암브로시오 / 金世博), layperson | South Korea | 1828 |
| Blessed Johann Nepomuk von Tschiderer zu Gleitheim, bishop | Italy | 1860 |
| Blessed Álvaro González López, religious | Spain | 1936 |
| Blessed Amadeo García Rodríguez, priest | Spain | 1936 |
| Blessed Antonio Delgado González, layperson | Spain | 1936 |
| Blessed Francisco Fernández Escosura, religious | Spain | 1936 |
| Blessed Juan Bautista Ferris Llopis, priest | Spain | 1936 |
| Blessed Julián Marcelino (Marcelino Rebollar Campo), religious | Spain | 1936 |
| Blessed Manuel Santiago Santiago, religious | Spain | 1936 |
| Blessed Pío Heredia Zubía, priest | Spain | 1936 |
| Blessed Valeriano Rodríguez García, priest | Spain | 1936 |
| Blessed Jan Franciszek Macha, priest | Poland | 1942 |
| Blessed Władysław Bukowiński, priest |  Kazakhstan | 1974 |
| December 4 |
| Saint Mercurius, layperson |  Turkiye | 250 |
| Saint John of Damascus, priest |  Palestine | 749 |
| Saint Anno, archbishop | Germany | 1075 |
| Saint Bernardo degli Uberti, cardinal | Italy | 1133 |
| Blessed Pier Pettinario, religious | Italy | 1289 |
| Blessed Francisco Gálvez Iranzo (フランシスコ･ガルベス), priest |  Japan | 1623 |
| Blessed Girolamo de Angelis (ジェロニモ･デ･アンジェリス), priest | Japan | 1623 |
| Blessed Ioannes Hara Mondo (ヨハネ 原 主水), layperson | Japan | 1623 |
| Blessed Simon Enpō (シモンえんぽ), religious | Japan | 1623 |
| Blessed Adolph Kolping, priest | Germany | 1865 |
| Blessed Ángel de la Vega González, religious | Spain | 1936 |
| Blessed Bienvenido Mata Ubierna, layperson | Spain | 1936 |
| Blessed Eulogio Álvarez López, religious | Spain | 1936 |
| Blessed Eustaquio García Chicote, religious | Spain | 1936 |
| Blessed Ezequiel Álvaro de la Fuente, religious | Spain | 1936 |
| Saint John Calabria (Giovanni Calabria), priest | Italy | 1954 |
| December 5 |
| Saint Dalmazzo di Pedona, bishop | Italy | 254 |
| Saint Crispina, layperson | Algeria | 304 |
| Saint Pelino di Brindisi, bishop | Italy | 662 |
| Saint Lucido di Aquara, religious | Italy | 1038 |
| Saint Geraldo de Moissac, archbishop | Portugal | 1108 |
| Blessed Bartolomeo Fanti, priest | Italy | 1495 |
| Saint John Almond, priest | England | 1612 |
| Blessed Niels Stensen, bishop | Germany | 1686 |
| Blessed Simon Kim Gang-i (김강이 시몬 / 金鋼伊), layperson | South Korea | 1815 |
| Blessed Anastasia Yi Bong-geum (이봉금 아나스타시아), layperson | South Korea | 1839 |
| Blessed Jean-Baptiste Fouque, priest | France | 1926 |
| Blessed Agustina Peña Rodríguez, religious | Spain | 1936 |
| Blessed Joaquín Jovaní Marín, priest | Spain | 1936 |
| Blessed Vicente Jovaní Ávila, priest | Spain | 1936 |
| Blessed Narcyz Putz, priest | Poland | 1942 |
| December 6 |
| Saint Nicholas of Myra, archbishop | Turkiye | 343 |
| Saint Gertrude d’Hamage, abbess | France | 649 |
| Saint Gerhard, cardinal | Germany | 1077 |
| Saint Obizio da Niardo, layperson | Italy | 1204 |
| Saint Pedro Pascual, bishop | Spain | 1300 |
| Saint Giuse Nguyễn Duy Khang, layperson |  Vietnam | 1861 |
| Blessed Esteban Vázquez Alonso, religious | Spain | 1936 |
| Blessed Florencio Rodríguez Güemes, religious | Spain | 1936 |
| Blessed Gregorio Cermeño Barceló, priest | Spain | 1936 |
| Blessed Heliodoro Ramos García, religious | Spain | 1936 |
| Blessed Ireneo Rodríguez González, priest | Spain | 1936 |
| Blessed Juan Larragueta Garay, religious | Spain | 1936 |
| Blessed Luis Martínez Alvarellos, religious | Spain | 1936 |
| Blessed Luisa María Frías Cañizares, layperson | Spain | 1936 |
| Blessed Miguel Lasaga Carazo, priest | Spain | 1936 |
| Blessed Narciso Pascual Pascual, religious | Spain | 1936 |
| Blessed Pascual de Castro Herrera, religious | Spain | 1936 |
| Blessed Vicente Vilumbrales Fuente, priest | Spain | 1936 |
| December 7 |
| Saint Eutychian, pope | Italy | 283 |
| Saint Charles Garnier, priest |  Canada | 1649 |
| Saint Maria Giuseppa Rossello, religious | Italy | 1880 |
| Blessed Aurelia Arambarri Fuente, religious | Spain | 1936 |
| Blessed Aurora López González, religious | Spain | 1936 |
| Blessed Benedicto Andrés (Enrique Andrés Monfort), religious | Spain | 1936 |
| Blessed Daría Andiarena Sagaseta, religious | Spain | 1936 |
| December 8 |
| Saint Budoc de Dol, archbishop | France | 585 |
| Saint Thibaut de Marly, abbot | France | 1247 |
| Blessed Ioannes Minami Gorōzaemon (ヨハネ 南 五郎左衛門), layperson | Japan | 1603 |
| Saint Noël Chabanel, priest | Canada | 1649 |
| Blessed Iacobus Gwon Sang-yeon (권상연 야고보 / 權尚然), layperson | South Korea | 1791 |
| Blessed Paulus Yun Ji-chung (윤지충 바오로 / 尹持忠), layperson | South Korea | 1791 |
| Blessed Brigida Choe (최 비르짓다 / 崔), layperson | South Korea | 1839 |
| Saint Narcisa de Jesús Martillo Morán, layperson |  Peru | 1869 |
| Blessed Antonio García Fernández, priest | Spain | 1936 |
| Blessed José María Zabal Blasco, layperson | Spain | 1936 |
| Blessed Rafael Román Donaire, priest | Spain | 1936 |
| Blessed Alojzy Liguda, priest | Germany | 1942 |
| December 9 |
| Saint Leocadia de Toledo, layperson | Spain | 303 |
| Blessed Agnes Takeda (アグネス 竹田), layperson | Japan | 1603 |
| Blessed Ioanna Takeda (ヨハンナ 竹田), layperson | Japan | 1603 |
| Blessed Ludovicus Minami (ルドビコ 南), layperson | Japan | 1603 |
| Blessed Magdalena Minami (マグダレナ 南), layperson | Japan | 1603 |
| Blessed Simon Takeda Gohyōe (シモン 竹田 五兵衛), layperson | Japan | 1603 |
| Blessed Liborius Wagner, priest | Germany | 1631 |
| Saint Pierre Fourier, priest | France | 1640 |
| Blessed Bernardo Maria di Gesù (Cesare Silvestrelli), priest | Italy | 1911 |
| Blessed Agustín García Calvo, religious | Spain | 1936 |
| Blessed Antonio Martín Hernández, priest | Spain | 1936 |
| Blessed Carmen Rodríguez Barazal, religious | Spain | 1936 |
| Blessed Dolores Broseta Boner, layperson | Spain | 1936 |
| Blessed Estefanía Irisarri Irigaray, religious | Spain | 1936 |
| Blessed Isidora Izquierdo García, religious | Spain | 1936 |
| Blessed José Ferrer Esteve, priest | Spain | 1936 |
| Blessed José Giménez López, priest | Spain | 1936 |
| Blessed Josefa Laborra Goyeneche, religious | Spain | 1936 |
| Blessed Julián Rodríguez Sánchez, priest | Spain | 1936 |
| Blessed León Justino (Francisco del Valle Villar), religious | Spain | 1936 |
| Blessed María del Pilar Nalda Franco, religious | Spain | 1936 |
| Blessed Recaredo de los Ríos Fabregat, priest | Spain | 1936 |
| December 10 |
| Saint Eulalia de Mérida, layperson | Spain | 304 |
| Saint Julia de Mérida, layperson | Spain | 304 |
| Saint Deiniol, bishop |  Scotland | 544 |
| Saint Luca di Melicuccà, bishop | Italy | 1114 |
| Blessed Brian Lacey, layperson | England | 1591 |
| Saint Edmund Gennings, priest | England | 1591 |
| Saint Eustace White, priest | England | 1591 |
| Blessed John Mason, layperson | England | 1591 |
| Saint Polydore Plasden, priest | England | 1591 |
| Blessed Sidney Hodgson, priest | England | 1591 |
| Saint Swithun Wells, layperson | England | 1591 |
| Saint John Roberts, priest | England | 1610 |
| Blessed Thomas Somers (Wilson), priest | England | 1610 |
| Blessed Florus Hyeon Gye-heum (현계흠 플로로 / 玄啓欽), layperson | South Korea | 1801 |
| Blessed Marcantonio Durando, priest | Italy | 1880 |
| Blessed Arsenio Maria da Trigolo (Giuseppe Antonio Migliavacca), priest | Italy | 1909 |
| Blessed Gonzalo Viñes Masip, priest | Spain | 1936 |
| Blessed Marcelino Martín Rubio, layperson | Spain | 1936 |
| Blessed María Emilia Riquelme Zayas, religious | Spain | 1940 |
| Blessed Anton Durcovici, bishop |  Romania | 1951 |
