M
| Ancient name | Location | Modern name | Also known as |
| Magnesia on the Maeander | Ionia, western Turkey, on the Maeander river | abandoned | Magnesia ad Maeandrum |
| Magnesia ad Sipylum | Lydia, western Turkey | Manisa | Magnesia on the Sipylum |
| Mallia | Crete, Greece | ||
| Mantineia | Arcadia, Greece | abandoned | Mantinea, Antigonia (Αντιγόνεια) |
| Marathon | Attica, Greece | Marathónas (Μαραθώνας), Marathōn (Μαραθών) | |
| Massalia | southern France | Marseilles | Massilia |
| Megalopolis | Arcadia, Greece | Sinanou (Σινάνο) | |
| Megara | Attica, Greece | ||
| Megara Hyblaea | near Augusta, eastern Sicily | destroyed | |
| Mesembria | Black Sea coast of Bulgaria | Nesebar | Menebria, Mesimvria (Μεσήμβρια), Mesimvria |
| Messene | southern Greece | ||
| Metapontum | Lucania, southern Italy | abandoned | Metapontium (Μεταπόντιον) |
| Methone | Messenia, southern Greece | Mothoni (Μοθώνη), Modon | |
| Methymna | Lesbos, in the Aegean Sea | Mithymna (Μήθυμνα), Molyvos, Molivos | |
| Miletus | western Turkey | abandoned | Milētos (Μίλητος) |
| Mochlos | Crete, Greece | ||
| Monastiraki | Crete, Greece | Minoan city | |
| Morgantina | central Sicily | abandoned | Murgantia, Morgantium, Μοργάντιον, Μοργαντίνη, Murgentia, Morgentia |
| Mylasa | Caria, south-western Turkey | Milas | |
| Myndus | Caria, western Turkey | Gümüşlük | Myndos (Μύνδος) |
| Myonia | Phocis, Greece | Agia Efthymia | Myania, Mynia |
| Myra | Lycia, Turkey | Demre | Kale |
| Myrmekion | Crimea, Ukraine | abandoned | Myrmēkion (Μυρμηκιων, Мирмекий) |
| Mytilene | Lesbos, in the Aegean Sea |
Read more about this topic: List Of Ancient Greek Cities