| Master of the Dominican Effigies | Italy | 1300–1400 | 9 |
| Master of the Dinteville Allegory | — | — | 1 |
| Master of the Die | — | 1512–1570 | 11 |
| Master of the Death of Saint Nicholas of Munster | Germany | 1490 | 1 |
| Master of the Day of Judgement | — | — | 12 |
| Master of the Collins Hours | — | — | 2 |
| Master of the Codex Rossiano | Italy | — | 1 |
| Master of the Coburg Roundels | Germany | 1500 | 8 |
| Master of the Clarisse Panel | — | 1300 | 1 |
| Master of the Brussels Epiphany | — | — | 1 |
| Master of the Brussels Calling of Saint Matthew | Habsburg Netherlands | — | 2 |
| Master of the Bracciolini Chapel | — | 1370–1420 | 1 |
| Master of the Borghese Tondo | — | 1450–1520 | 2 |
| Master of the Blue Crucifixes | — | 1240–1260 | 1 |
| Master of the Biberach Holy Kinship | Germany | 1500–1600 | 1 |
| Master of the Berswordt Altar | — | — | 2 |
| Master of the Benediktbeuren Madonna | — | 1380–1450 | 1 |
| Master of the Benediktbeuren Crucifixion | — | 1440–1460 | 1 |
| Master of the Baroncelli Portraits | County of Flanders | 1500–1600 | 3 |
| Master of the Banderoles | Kingdom of the Netherlands | 1450 | 3 |
| Master of the Bambino Vispo | — | 1400–1500 | 1 |
| Master of the Argonauts | — | — | 1 |
| Master of the Apollo and Daphne Legend | — | 1470–1520 | 2 |
| Master of the Acts of Mercy | Austria | 1440 | 1 |
| Master of San Torpè | — | 1250–1325 | 3 |
| Master of San Miniato | — | 1450–1490 | 1 |
| Master of San Martino alla Palma | — | 1300–1350 | 6 |
| Master of Saint Severin | Germany | 1500–1600 | 3 |
| Master of Saint Gilles | France | 1500–1600 | 6 |
| Master of Roncaiette | Italy | — | 1 |
| Master of Pulkau | — | — | 1 |
| Master of Portraits of Princes | Southern Netherlands | 1500 | 2 |
| Master of Marradi | — | 1500–1600 | 8 |
| Master of Liesborn | — | 1450–1495 | 12 |
| Master of Lecceto | — | — | 1 |
| Master of Guillaume Lambert | — | — | 1 |
| Master of Eggenburg | — | — | 2 |
| Master of Cubélls | Spain | — | 1 |
| Master of Città di Castello | — | 1290–1315 | 2 |
| Master of Charles of Durazzo | — | — | 3 |
| Master of 1499 | Southern Netherlands | 1470–1499 | 3 |
| Master I. A. M. of Zwolle | — | 1425–1504 | 4 |
| Mäster Hillebrandt | Sweden | — | 1 |
| Master Heinrich of Constance | — | 1300–1400 | 1 |
| Master H.A. or A.H. | Austria | 1599 | 1 |
| Master G.Z. | — | — | 1 |
| Master A. G. | — | — | 3 |
| Mastelletta | — | 1575–1655 | 2 |
| Massimo Stanzione | Regno 'e Napule | 1585–1656 | 15 |
| Massimo D'Azeglio | Kingdom of Italy | 1798–1866 | 1 |
| Massimiliano Soldani Benzi | Italy | 1656–1740 | 7 |
| Mason Chamberlin | — | 1727–1787 | 1 |
| Masolino da Panicale | — | 1383–1447 | 9 |
| Maso Finiguerra | Duchy of Florence | 1426–1464 | 3 |
| Maso di Banco | — | 1250–1348 | 5 |
| Masaccio | — | 1401–1428 | 17 |
| Mary Way | United States | 1769–1833 | 1 |
| Mary Russell Smith | United States | 1842–1878 | 2 |
| Mary Roberts | United States | 1761 | 5 |
| Mary Nimmo Moran | United Kingdom | 1842–1899 | 8 |