| Motreff | |
| Native Name: | Motrev |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Motreff (Finistère).svg |
| Coordinates: | 48.2028°N -3.5531°W |
| Elevation Min M: | 72 |
| Elevation Max M: | 258 |
| Insee: | 29152 |
| Postal Code: | 29270 |
| Arrondissement: | Châteaulin |
| Canton: | Carhaix-Plouguer |
| Mayor: | Samuel Féat[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Poher |
| Area Km2: | 21.59 |
Motreff (in French pronounced as /mɔtʁɛf/;) is a commune in the Finistère department of Brittany in north-western France.
Historically, Motreff belongs to Cornouaille. The village lies on the northern slope of the Montagnes Noires (french, Black Mountains). The village centre is located 8km (05miles) south of Carhaix-Plouguer.
Inhabitants of Motreff are called in French Motreffois.