| Trössing | |
| Settlement Type: | Former municipality |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 46.8267°N 15.8197°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Styria |
| Subdivision Type2: | District |
| Subdivision Name2: | Südoststeiermark |
| Parts Style: | para |
| Area Total Km2: | 4.16 |
| Elevation M: | 260 |
| Population Total: | 277 |
| Population As Of: | 1 January 2016 |
| Population Footnotes: | [1] |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Registration Plate: | RA |
| Postal Code Type: | Postal code |
| Postal Code: | 8342, 8345 |
| Area Code Type: | Area code |
| Area Code: | 03477 |
| Website: | www.troessing. steiermark.at |
Trössing is a former municipality in the district of Südoststeiermark in the Austrian state of Styria. Since the 2015 Styria municipal structural reform, it is part of the municipality Gnas.[2]