| Fréthun | |
| Native Name: | Fraaituin |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Fréthun.svg |
| Arrondissement: | Calais |
| Canton: | Calais-1 |
| Insee: | 62360 |
| Postal Code: | 62185 |
| Mayor: | Guy Heddebaux[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Grand Calais Terres et Mers |
| Coordinates: | 50.9175°N 1.8258°W |
| Elevation M: | 11 |
| Elevation Min M: | 0 |
| Elevation Max M: | 60 |
| Area Km2: | 7.92 |
Fréthun (pronounced as /fr/; vls|Fraaituin|lang) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France.[2]
A village located 3 miles (5 km) southwest of Calais, at the junction of the D215 and D246 roads. It is home to the Calais-Fréthun railway station and the Eurotunnel terminal, linking France with England.
The inhabitants are called Fréthunois.