| Le Quiou | |
| Native Name: | Ar C'haeoù |
| Commune Status: | Commune |
| Coordinates: | 48.3519°N -2.0047°W |
| Insee: | 22263 |
| Postal Code: | 22630 |
| Arrondissement: | Dinan |
| Canton: | Lanvallay |
| Mayor: | Arnaud Carré[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Dinan Agglomération |
| Elevation Min M: | 13 |
| Elevation Max M: | 77 |
| Area Km2: | 5.06 |
Le Quiou (in French pronounced as /lə kju/; Breton: Ar C'haeoù) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
Le Quiou has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Le Quiou is . The average annual rainfall is with November as the wettest month. The temperatures are highest on average in July, at around, and lowest in January, at around . The highest temperature ever recorded in Le Quiou was on 5 August 2003; the coldest temperature ever recorded was on 25 February 1986.
The inhabitants of Le Quiou are known in French as quiousiens.