| Plouisy | |
| Native Name: | Plouizi |
| Commune Status: | Commune |
| Coordinates: | 48.5783°N -3.1825°W |
| Insee: | 22223 |
| Postal Code: | 22200 |
| Arrondissement: | Guingamp |
| Canton: | Guingamp |
| Mayor: | Rémy Guillou[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Guingamp-Paimpol Agglomération |
| Elevation Min M: | 55 |
| Elevation Max M: | 195 |
| Area Km2: | 23.63 |
Plouisy (in French pronounced as /pluizi/;) is a commune in the Côtes-d'Armor department of Brittany in north-western France. Plouisy is 407 kilometres from Paris.
Plouisy has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Plouisy is . The average annual rainfall is with December 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 Plouisy was on 9 August 2003; the coldest temperature ever recorded was on 17 January 1985.
Inhabitants of Plouisy are called plouisyens in French.