| Mathilde Weil | United States | 1872–1918 | 1 |
| Mathilde Battenberg | Germany | 1878–1936 | 2 |
| Mathieu-Meusnier | France | 1824–1896 | 1 |
| Mathieu Le Nain | France | 1607–1677 | 3 |
| Mathieu Jacquet | France | 1545–1611 | 1 |
| Mathieu Elias | France | 1658–1741 | 1 |
| Mathieu Cochereau | France | 1793–1817 | 1 |
| Mathieu Blot | France | 1753–1818 | 2 |
| Mathias Stoltenberg | Norway | 1799–1871 | 1 |
| Mathias Palbitzki | Sweden | 1623–1677 | 8 |
| Mathias Nicolas Marie Vivier | France | 1788–1859 | 2 |
| Mathias Blumenthal | Norway | 1719–1763 | 3 |
| Mathias Beytler | Germany | 1550–1614 | 5 |
| Mathew Brady Studio | — | — | 3 |
| Mathew Benjamin Brady | United States | 1822–1896 | 12 |
| Mather Brown | United States | 1761–1831 | 12 |
| Mateo Gilarte | Crown of Aragon | 1629–1675 | 9 |
| Mateo Cerezo | Spain | 1637–1666 | 12 |
| Master with the Parrot | Habsburg Netherlands | 1500–1530 | 5 |
| Master of Winkler's Epitaph | — | 1465–1495 | 2 |
| Master of Virgin with Scales | — | — | 1 |
| Master of Varlungo | — | 1201 | 1 |
| Master of Uttenheim | — | 1450–1490 | 2 |
| Master of the Worcester Carrying of the Cross | Germany | 1400 | 2 |
| Master of the Wendelin Altar | — | — | 1 |
| Master of the Washington Coronation | — | 1300–1400 | 1 |
| Master of the Von Groote Adoration | — | 1500–1520 | 11 |
| Master of the Virgo inter Virgines | — | 1401–1505 | 5 |
| Master of the Virgin of Benediktbeuern | — | 1380–1450 | 1 |
| Master of the View of Saint Gudula | — | — | 5 |
| Master of the Utrecht Adoration | — | 1510–1540 | 4 |
| Master of the Tversk school | — | — | 2 |
| Master of the Turin Adoration | — | — | 1 |
| Master of the Tiburtine Sibyl | Netherlands | 1475–1495 | 2 |
| Master of the Stroganov school | — | — | 4 |
| Master of the Stories of San Ladislao | Italy | — | 1 |
| Master of the Stockholm Pietà | — | — | 1 |
| Master of the Starck Triptych | — | — | 3 |
| Master of the Small Landscapes | Southern Netherlands | — | 1 |
| Master of the Sigena chapter house | — | — | 4 |
| Master of the Sebastian Diptych | Germany | 1500–1600 | 1 |
| Master of the Schotten Altarpiece | Germany | 1450–1501 | 1 |
| Master of the San Lucchese Altarpiece | — | — | 2 |
| Master of the Saint Lambrecht Votive Altarpiece | Austria | 1401–1450 | 1 |
| Master of the Saint Godelieve Legend | — | 1500 | 1 |
| Master of the Saint Bartholomew Altarpiece | — | 1450–1510 | 16 |
| Master of the Repudiation of Hagar | Kingdom of the Netherlands | — | 1 |
| Master of the Regular Canons' Altarpiece | Germany | 1425–1475 | 1 |
| Master of the Rebel Angels | — | 1400–1400 | 2 |
| Master of the Prodigal Son | Habsburg Netherlands | 1600 | 3 |
| Master of the Presentation of Christ | Austria | — | 1 |
| Master of the Prado Adoration of the Magi | Netherlands | — | 2 |
| Master of the Polling Panels | Germany | 1405–1490 | 5 |
| Master of the Playing Cards | Germany | — | 1 |
| Master of the Pesaro Crucifix | — | — | 1 |
| Master of the Passion of Christ | — | 1500–1500 | 1 |
| Master of the Parement | France | 1361–1500 | 1 |
| Master of the Panzano Triptych | — | — | 1 |
| Master of the Palazzo Venezia Madonna | — | — | 4 |
| Master of the Palaces | Italy | — | 1 |