| Espès-Undurein | |
| Native Name: | Espeize-Ündüreine |
| Commune Status: | Commune |
| Arrondissement: | Oloron-Sainte-Marie |
| Canton: | Montagne Basque |
| Insee: | 64214 |
| Postal Code: | 64130 |
| Mayor: | Michel Ibarra[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Pays Basque |
| Coordinates: | 43.2683°N -0.8792°W |
| Elevation M: | 149 |
| Elevation Min M: | 105 |
| Elevation Max M: | 233 |
| Area Km2: | 9.78 |
Espès-Undurein (in French pronounced as /ɛspɛs œ̃dyʁɛ̃/;)[2] is a commune in the Pyrénées-Atlantiques department in south-western France.
It is located in the former province of Soule.[2]