| Gamarthe | |
| Native Name: | Gamarte |
| Commune Status: | Commune |
| Arrondissement: | Bayonne |
| Canton: | Montagne Basque |
| Insee: | 64229 |
| Postal Code: | 64220 |
| Mayor: | Jean-Michel Bicain[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Pays Basque |
| Coordinates: | 43.2022°N -1.1422°W |
| Elevation M: | 487 |
| Elevation Min M: | 196 |
| Elevation Max M: | 642 |
| Area Km2: | 9.91 |
Gamarthe (in French pronounced as /ɡamaʁt/; Basque: Gamarte)[2] is a commune in the Pyrénées-Atlantiques department in south-western France.
It is located in the former province of Lower Navarre.[2]