| Trégonneau | |
| Native Name: | Tregonev |
| Commune Status: | Commune |
| Coordinates: | 48.6122°N -3.1625°W |
| Insee: | 22358 |
| Postal Code: | 22200 |
| Arrondissement: | Guingamp |
| Canton: | Bégard |
| Mayor: | Stéphanie Caradec-Bocher[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Guingamp-Paimpol Agglomération |
| Elevation Min M: | 43 |
| Elevation Max M: | 135 |
| Area Km2: | 6.32 |
Trégonneau (in French pronounced as /tʁeɡɔno/;) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
Inhabitants of Trégonneau are called trégonnois in French.