| Mœrnach | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville de Moernach (68).svg |
| Arrondissement: | Altkirch |
| Canton: | Altkirch |
| Insee: | 68212 |
| Postal Code: | 68480 |
| Mayor: | Patrick Stemmelin[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 47.5044°N 7.2558°W |
| Elevation M: | 472 |
| Elevation Min M: | 417 |
| Elevation Max M: | 644 |
| Area Km2: | 6.79 |
Mœrnach (in French pronounced as /mœʁnak/; German: Mörnach; Swiss German; Alemannic; Alsatian: Märnà) is a commune in the Haut-Rhin department in Alsace in north-eastern France.