| Celebration | Name | Saint | Birth | Death |
|---|---|---|---|---|
| 3 of January | Daniel | Saint Daniel deacon and martyr | 304 Italy | |
| 5 of January | Deogratias | Saint Deogratias | 458 Tunisia | |
| 10 of January | Domitian | Saint Domitian | 602 Armenia | |
| 14 of January | Dacius | Saint Dacius | 552 Italy | |
| 16 of January | Danacto | Saint Danacto | Albania | |
| 18 of January | Deicola | Saint Deicola | France | |
| 22 of January | Domingo | Saint Domingo, abad | 1031 Italy | |
| 27 of January | Devota | Saint Devota | 300 France | |
| 30 of January | David | Saint David Galván | 1915 Mexico | |
| 6 of February | Dorotea | Saint Dorotea of Capadocia | Turkey | |
| 15 of February | Decorosus | Saint Decorosus | 680 Italy | |
| 22 of February | Diego | Blessed Diego Carvalho | 1624 Japan | |
| 28 of February | Daniel Alejo | Blessed Daniel Alexis Brottier | 1936 France | |
| 1 of March | Dositeo | Saint Dositheus | Israel | |
| 1 of March | David | Saint David of Wales | 601 United kingdom | |
| 8 of March | Duthac | Saint Duthac | 1065 United kingdom | |
| 10 of March | Droctoveus | Saint Droctoveus | 580 France | |
| 11 of March | Domingo | Saint Domingo Câm | 1859 China | |
| 24 of March | Diego | Blessed Diego José of Cádiz | 1801 Spain | |
| 25 of March | Dimas | Saint Dismas the Good Thief | 35 Israel | |
| 25 of March | Dula | Saint Dula | Turkey | |
| 26 of March | Desiderius | Saint Desiderius | Italy | Italy |
| 30 of March | Domninus | Saint Domninus | Macedonia, the former yugoslav republic of | |
| 31 of March | Domnino | Saint Guido, abad | 1046 Italy | |
| 2 of April | Domingo | Saint Domingo Tuoc | 1839 Viet nam | |
| 2 of April | Diego Luis | Saint Diego Luis of San Vitores | 1672 Guam | |
| 8 of April | Dionisio | Saint Dionysious of Corinth | Greece | 180 Greece |
| 8 of April | Domingo | Blessed Domingo del Santisimo Sacramento Iturrate | Spain | 1927 Spain |
| 8 of April | Dionysius | Saint Dionysius of Alexandria | Egypt | 265 Egypt |
| 9 of April | Demetrius | Saint Demetrius of Thessaloniki | Hungary | |
| 11 of April | Domnius | Saint Domnius of Salona | 299 Croatia (Hrvatska) | |
| 12 of April | Damian | Saint Damian of Pavia | 697 Italy | |
| 12 of April | David | Saint David Uribe | Mexico | |
| 15 of April | Damián | Blessed Damien of Veuster | 1889 Australia | |
| 16 of April | Drogo | Saint Drogo | 1186 France | |
| 17 of April | Donnan | Saint Donnan abbot and companions | 617 United kingdom | |
| 20 of April | Domingo | Blessed Domenico Vernagalli | 1218 Italy | |
| 24 of April | Dova | Saint Dova | ||
| 24 of April | Deodatus | Saint Deodatus of Blois | France | |
| 26 of April | Domingo | Blessed Domingo | Spain | |
| 30 of April | Donatus | Saint Donatus of Evorea | Italy | |
| 6 of May | Dominic | Saint Dominic Savio | 1842 Italy | 1857 Italy |
| 7 of May | Domitila | Saint Domitila y compañeros | Italy | Italy |
| 8 of May | Desideratus | Saint Desideratus of Bourges | 550 France | |
| 8 of May | Dionysius | Saint Dionysius bishop | ||
| 9 of May | Dionysius | Saint Dionysius of Vienne | France | |
| 10 of May | Damián | Saint Damien of Molokai | 1840 Belgium | 1889 United States |
| 10 of May | Dioscorides | Saint Dioscorides of Smyrna | Italy | |
| 12 of May | Domingo | Saint Dominic de la Calzada | 1019 Spain | 1109 Spain |
| 12 of May | Domitila | Saint Domitila of Roma | Italy | Italy |
| 15 of May | Dympna | Saint Dympna | Ireland | Belgium |
| 18 of May | Dioscorus | Saint Dioscorus of Alexandria | 303 Egypt | |
| 19 of May | Dunstan | Saint Dunstan of Canterbury | 988 United kingdom | |
| 19 of May | Dominic | Juan of Saint Dominic Martínez | 1619 Japan | |
| 22 of May | Domingo | Saint Domingo Ngon | Viet nam | 1862 Viet nam |
| 23 of May | Desiderio | Saint Desiderius of Langres | 355 France | |
| 25 of May | Dionysus | Saint Dionysus Ssebuggwawo | Uganda | 1886 Uganda |
| 25 of May | Dionysius | Saint Dionysius of Milán | Italy | 361 Armenia |
| 26 of May | Desiderius | Saint Desiderius of Vienne | France | France |
| 30 of May | Dimpna | Saint Dinfna | Netherlands | |
| 2 of June | Domingo | Saint Domingo Ninh | Viet nam | 1862 Viet nam |
| 2 of June | Dictinus | Saint Dictinus | Spain | |
| 3 of June | Diego | Blessed Diego Oddi | 1839 Italy | 1919 Italy |
| 3 of June | Davinus | Saint Davinus the armenian | Armenia | 1051 Italy |
| 5 of June | Dorotheus | Saint Dorotheus of Tyre | 255 Lebanon | 362 Bulgaria |
| 9 of June | Diomedes | Saint Diomedes of Nicea | Turkey | |
| 10 of June | Diana | Blessed Diana of Andalo | 1200 Italy | 1236 Italy |
| 14 of June | Digna | Saint Digna of Cordoba | Spain | 853 Spain |
| 19 of June | Deodatus | Saint Deodatus of Nevers | 679 France | |
| 20 of June | Dermicio | Blessed Dermot O’Hurley | 1584 Ireland | |
| 21 of June | Demetria | Saint Demetria of Roma | 363 Italy | |
| 25 of June | Dorotea | Blessed Dorothy of Montau | 1394 Poland | |
| 25 of June | Domingo | Saint Domingo Henares | 1838 Viet nam | |
| 26 of June | David | Saint David of Thessaloniki | 540 Macedonia, the former yugoslav republic of | |
| 26 of June | Deodatus | Saint Deodatus of Nola | 405 Italy | |
| 1 of July | Domitian | Saint Domitian of Bebron | France | |
| 3 of July | Datus | Saint Datus of Ravenna | 190 Italy | |
| 5 of July | Domitius | Saint Domitius the Doctor | Armenia | |
| 6 of July | Dominica | Saint Dominica of Tropea | Italy | |
| 8 of July | Disibod | Saint Disibod of Renania | Germany | |
| 11 of July | Drostan | Saint Drostan of Deer | United kingdom | |
| 12 of July | David | Blessed David Gunston | 1581 United kingdom | |
| 15 of July | David | Saint David of Sweden | United kingdom | 1082 Sweden |
| 18 of July | Domingo | Saint Domingo Nicolás Dinh Dat | 1859 Viet nam | |
| 19 of July | Dius | Saint Dius Thaumaturge | Turkey | |
| 21 of July | Daniel | Saint Daniel Prophet | ||
| 24 of July | Declan | Saint Declan of Ardmore | Ireland | |
| 27 of July | Desideratus | Saint Desideratus of Besançon | France | |
| 7 of August | Donatian | Saint Donatian | Belgium | |
| 7 of August | Donatus | Saint Donatus of Arezzo | Italy | |
| 7 of August | Donatus | Saint Donatus of Besançon | 568 Germany | |
| 8 of August | Domingo | Saint Dominic of Guzman | 1170 Spain | 1221 Italy |
| 12 of August | Digna | Saint Digna of Augsburgo | 304 Germany | |
| 19 of August | Donatus | Saint Donatus of Sisteron | France | |
| 27 of August | David | Saint David Lewis | 1616 United kingdom | 1679 United kingdom |
| 27 of August | Domingo | Blessed Dominic Barberi | 1792 Italy | 1849 United kingdom |
| 29 of August | Domingo | Blessed Dominik Jedrzejewski | 1886 Poland | 1942 Germany |
| 6 of September | Diego | Blessed Diego Llorca Llopis | 1896 Spain | 1936 Spain |
| 11 of September | Daniel | Saint Daniel Wyn | 584 United kingdom | |
| 15 of September | Dolores | Our Lady of Sorrows |