| Marseillan | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Marseillan (65).svg |
| Arrondissement: | Tarbes |
| Canton: | Les Coteaux |
| Insee: | 65301 |
| Postal Code: | 65350 |
| Mayor: | Claude Cazanave[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Coteaux du Val d'Arros |
| Coordinates: | 43.3064°N 0.2164°W |
| Elevation M: | 260 |
| Elevation Min M: | 194 |
| Elevation Max M: | 322 |
| Area Km2: | 4.4 |
Marseillan (in French pronounced as /maʁsɛjɑ̃/; Occitan (post 1500);: Marcelhan) is a commune in the Hautes-Pyrénées department in south-western France.