| Arros | |
| Pushpin Map: | France#France Occitanie |
| Mouth Coordinates: | 43.6622°N -0.0281°W |
| Subdivision Type1: | Country |
| Length: | 130km (80miles) |
| Discharge1 Avg: | 9m3/s |
| Basin Size: | 947km2 |
The Arros (in French pronounced as /aʁɔs/; Occitan (post 1500);: Arròs) is a right tributary of the Adour, in the Southwest of France. It is 130.2km (80.9miles) long.
The name Arros is based on the root Arr- 'stone' and the suffix -os.
The Arros rises in the Baronnies of Pyrenees, southeast of Bagnères-de-Bigorre, below the Signal de Bassia (1 921 m).
It flows north through a narrow valley defended by the castle of Mauvezin and the bastide of Tournay. It joins the Adour before it turn west, upstream from Riscle.
Bourg-de-Bigorre, Tournay, Chelle-Debat
Montégut-Arros, Villecomtal-sur-Arros, Plaisance.