| Treia Treja | |
| Image Coa: | DEU Treia COA.svg |
| Coordinates: | 54.5°N 28°W |
| Image Plan: | Treia in SL.PNG |
| State: | Schleswig-Holstein |
| District: | Schleswig-Flensburg |
| Amt: | Arensharde |
| Elevation: | 5 |
| Area: | 21.73 |
| Postal Code: | 24896 |
| Area Code: | 04626 |
| Licence: | SL |
| Gemeindeschlüssel: | 01 0 59 092 |
| Website: | www.amt- silberstedt.de |
| Mayor: | Carsten Görrissen |
Treia (Danish: Treja) is a municipality in the district of Schleswig-Flensburg, in Schleswig-Holstein, Germany.