| Marzio | | MAHR-tsyo | Italian | |
| Massimiliano | | mahs-see-mee-LYAH-no | Italian | |
| Massimo | | mahs-SEE-mo | Italian | |
| Matilde | | mah-TEEL-de (Spanish) | Spanish, Portuguese, Italian | |
| Mattea | | maht-TE-ah | Italian | |
| Matteo | | maht-TE-o | Italian | |
| Mattia | | maht-TEE-ah | Italian | |
| Maura (1) | | MOW-rah (Italian, Spanish) | Italian, Spanish, Late Roman | |
| Maurizio | | mow-REE-tsyo | Italian | |
| Mauro | | MOW-ro (Italian) | Italian, Portuguese (Brazilian) | |
| Melania | | me-LAHN-yah (Polish) | Italian, Spanish, Polish, Late Roman | |
| Melchiorre | | mel-KYOR-re | Italian | |
| Micaela | | - | Italian, Spanish, Portuguese | |
| Michela | | mee-KE-lah | Italian | |
| Michelangela | | - | Italian | |