| Trofaiach | |
| Settlement Type: | Municipality |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 47.426°N 15.0067°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Styria |
| Subdivision Type2: | District |
| Subdivision Name2: | Leoben |
| Parts Style: | para |
| Leader Title: | Mayor |
| Leader Name: | Mario Abl |
| Elevation M: | 658 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Registration Plate: | LN |
| Postal Code Type: | Postal code |
| Postal Code: | 8793 |
| Area Code Type: | Area code |
| Area Code: | +43 3847 |
| Website: | trofaiach.steiermark.at |
Trofaiach is a municipality in the Leoben district of the state of Styria in Austria, the site of a post World War II British sector displaced persons camp. On 1 January 2013, it was merged with the neighbouring municipalities of Hafning bei Trofaiach and Gai. The municipality had 11,003 inhabitants on 1 January 2023.