| Campistrous | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Campistrous (65).svg |
| Arrondissement: | Bagnères-de-Bigorre |
| Canton: | La Vallée de la Barousse |
| Insee: | 65125 |
| Postal Code: | 65300 |
| Mayor: | Xavier Sarniguet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC du Plateau de Lannemezan |
| Coordinates: | 43.1531°N 0.3781°W |
| Elevation M: | 540 |
| Elevation Min M: | 435 |
| Elevation Max M: | 615 |
| Area Km2: | 10.12 |
Campistrous is a commune in the Hautes-Pyrénées department in south-western France.
The Petite Baïse forms part of the commune's north-eastern border.
Campistrous has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Campistrous is . The average annual rainfall is with May 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 Campistrous was on 20 July 1989; the coldest temperature ever recorded was on 8 February 2012.