| MASTER of Hoogstraeten | 1480-1530 | Flemish | painter |
| MASTER of Magdalen | 1245-1290 | Italian | painter |
| MASTER of Marradi | 1470-1510 | Italian | painter |
| MASTER of Mary of Burgundy | 1450-1500 | Flemish | illuminator |
| MASTER of Monte Oliveto | 1290-1340 | Italian | painter |
| MASTER of Moulins | 1460-1510 | French | painter |
| MASTER of Pratovecchio | 1420-1460 | Italian | painter |
| MASTER of Saint Cecilia | 1280-0 | Italian | painter |
| MASTER of Saint Nicholas | 1450-1500 | Spanish | painter |
| MASTER of Saint Veronica | 1380-1430 | German | painter |
| MASTER of San Francesco Bardi | 1220-1270 | Italian | painter |
| MASTER of San Lucchese | 1320-1370 | Italian | painter |
| MASTER of San Miniato | 1440-1490 | Italian | painter |
| MASTER of San Trovaso | 1450-1500 | Italian | sculptor |
| MASTER of St Francis | 1440-1490 | Italian | painter |
| MASTER of St. Gilles | 1480-1530 | French | painter |
| MASTER of the Acquavella Still-Life | 1590-1630 | Italian | painter |
| MASTER of the Acts of Mercy | 1440-1480 | Austrian | painter |
| MASTER of the Aix Annunciation | 1420-1470 | French | painter |
| MASTER of the Aix-la-Chapelle Altarpiece | 1460-1530 | German | painter |
| MASTER of the Albertini | 1290-1330 | Italian | painter |
| MASTER of the Annunciation to the Shepherds | 1610-1650 | Italian | painter |
| MASTER of the Antwerp Adoration | 1480-1530 | Flemish | painter |
| MASTER of the Avignon School | 1430-1470 | French | painter |
| MASTER of the Bambino Vispo | 1400-1440 | Italian | painter |
| MASTER of the Berswordt Altarpiece | 1360-1410 | German | painter |
| MASTER of the Blue Crucifixes | 1230-1270 | Italian | painter |
| MASTER of the Blue Jeans | 1660-1710 | Italian | painter |
| MASTER of the Borgo Crucifix | 1230-1270 | Italian | painter |
| MASTER of the Brunswick Monogram | 1500-1550 | Flemish | painter |