| Mertzen | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville de Mertzen (68).svg |
| Arrondissement: | Altkirch |
| Canton: | Masevaux-Niederbruck |
| Insee: | 68202 |
| Postal Code: | 68210 |
| Mayor: | José Wininger[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 47.5911°N 7.1311°W |
| Elevation M: | 350 |
| Elevation Min M: | 329 |
| Elevation Max M: | 400 |
| Area Km2: | 2.01 |
Mertzen (in French pronounced as /mɛʁtsən/;) is a commune in the Haut-Rhin department in Alsace in north-eastern France.