| Arbéost | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville d'Arbéost (Hautes-Pyrénées).svg |
| Arrondissement: | Argelès-Gazost |
| Canton: | La Vallée des Gaves |
| Insee: | 65018 |
| Postal Code: | 65560 |
| Mayor: | Cyrille Fraize[1] |
| Term: | 2021 - 2026 |
| Coordinates: | 42.9992°N -0.2842°W |
| Elevation M: | 780 |
| Elevation Min M: | 555 |
| Elevation Max M: | 2480 |
| Area Km2: | 14.9 |
Arbéost (pronounced as /fr/; oc|Arbiost) is a commune in the Hautes-Pyrénées department in southwestern France.
Arbéost has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Arbéost is . The average annual rainfall is with November as the wettest month. The temperatures are highest on average in August, at around, and lowest in January, at around . The highest temperature ever recorded in Arbéost was on 27 June 2019; the coldest temperature ever recorded was on 8 February 2012.