| Sankt Sebastian | |
| Settlement Type: | Former municipality |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 47.785°N 15.3083°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Styria |
| Subdivision Type2: | District |
| Subdivision Name2: | Bruck-Mürzzuschlag |
| Parts Style: | para |
| Area Total Km2: | 47.4 |
| Elevation M: | 851 |
| Population Total: | 1015 |
| 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: | BM |
| Postal Code Type: | Postal code |
| Postal Code: | 8630 |
| Area Code Type: | Area code |
| Area Code: | 03882 |
| Website: | www.st-sebastian.at |
Sankt Sebastian is a former municipality in the district of Bruck-Mürzzuschlag in the Austrian province of Styria. It lies some to the north of the important pilgrimage centre of Mariazell. Since the 2015 Styria municipal structural reform, it is part of the municipality Mariazell.[2]
Mariazell railway station, the terminus of the narrow gauge Mariazell line from St Pölten, lies within the municipality. The station is also the terminus of the Museumstramway Mariazell-Erlaufsee, a standard gauge heritage steam tramway that operates to the nearby Erlaufsee.