| MASTER of the Mascoli Altar | 1400-1450 | Italian | sculptor |
| MASTER of the Munich Marian Panels | 1430-1470 | German | painter |
| MASTER of the Osservanza | 1410-1450 | Italian | painter |
| MASTER of the Palazzo Venezia Madonna | 1330-1370 | Italian | painter |
| MASTER of the Parrot | 1501-1550 | Flemish | painter |
| MASTER of the Pesaro Crucifix | 1360-1400 | Italian | painter |
| MASTER of the Pfullendorf Altar | 1480-1520 | German | painter |
| MASTER of the Piccolomini Madonna | 1450-1500 | Italian | sculptor |
| MASTER of the Pietà | 1330-1375 | Italian | painter |
| MASTER of the Playing Cards | 1415-1455 | German | graphic artist |
| MASTER of the Polling Panels | 1415-1455 | German | painter |
| MASTER of the Prodigal Son | 1510-1560 | Flemish | painter |
| MASTER of the Registrum Gregorii | 950-1010 | German | illuminator |
| MASTER of the St. Bartholomew Altar | 1470-1510 | German | painter |
| MASTER of the Story of Griselda | 1470-1510 | Italian | painter |
| MASTER of the Straus Madonna | 1380-1420 | Italian | painter |
| MASTER of the Tegernsee Passion | 1410-1450 | German | painter |
| MASTER of the Trebon Altarpiece | 1360-1420 | Bohemian | painter |
| MASTER of the Vienna Adoration | 1390-1430 | Austrian | painter |
| MASTER of the View of Ste Gudule | 1460-1500 | Flemish | painter |
| MASTER of the Virgo inter Virgines | 1450-1500 | Netherlandish | painter |
| MASTER of the Votive Panel of Sankt Lambrecht | 1410-1450 | Austrian | painter |
| MATEJKO, Jan | 1838-1893 | Polish | painter |
| MATES, Joan | 1370-1431 | Catalan | painter |
| MATHAM, Jacob | 1571-1631 | Netherlandish | graphic artist |
| MATHAM, Theodor | 1605-1676 | Dutch | graphic artist |
| MATHEY, Jean Baptiste | 1630-1696 | French | architect |
| MATTEINI, Teodoro | 1754-1831 | Italian | painter |
| MATTEIS, Paolo de | 1662-1728 | Italian | painter |
| MATTEO DA CAMPIONE | 1335-1396 | Italian | architect |