| Treffen am Ossiacher See | |
| Native Name: | Treffen am Ossiacher See |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 46.6667°N 64°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Carinthia |
| Subdivision Type2: | District |
| Subdivision Name2: | Villach-Land |
| Parts Style: | para |
| Leader Title: | Mayor |
| Leader Name: | Klaus Glanznig [1] |
| Leader Party: | SPÖ |
| Elevation M: | 542 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 9521 |
| Area Code Type: | Area code |
| Area Code: | 04248 |
| Website: | www.treffen.at |
Treffen am Ossiacher See (Slovenian: Trebinje) is a market town in the district of Villach-Land in Carinthia in south-central Austria.
The municipality lies about 8 km north of Villach.