| Coisia | |
| Coordinates: | 46.3064°N 5.5817°W |
| Insee: | 39158 |
| Postal Code: | 39240 |
| Arrondissement: | Lons-le-Saunier |
| Canton: | Moirans-en-Montagne |
| Commune: | Thoirette-Coisia |
| Elevation Min M: | 285 |
| Elevation Max M: | 756 |
| Area Km2: | 6.73 |
| Population: | 175 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Coisia (in French pronounced as /kwazja/) is a former commune in the Jura department in Bourgogne-Franche-Comté in eastern France. On 1 January 2017, it was merged into the new commune Thoirette-Coisia.[2]