| Bad Traunstein | |
| Settlement Type: | Municipality |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 48.4167°N 15.0833°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Lower Austria |
| Subdivision Type2: | District |
| Subdivision Name2: | Zwettl |
| Parts Style: | para |
| Leader Title: | Mayor |
| Leader Name: | Roland Zimmer |
| Elevation M: | 923 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Registration Plate: | ZT |
| Postal Code Type: | Postal code |
| Postal Code: | 3632 |
| Area Code Type: | Area code |
| Area Code: | 02878 |
| Website: | www.traunstein.gv.at |
Bad Traunstein (formerly Traunstein) is a market town and municipality in the district of Zwettl in the Austrian state of Lower Austria. In 2010 its official name was changed into Bad Traunstein,[1] referring to the local spa complex that had been opened a few years earlier (cf. German bad 'spa').