| Gastern | |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 48.8833°N 15.2167°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Lower Austria |
| Subdivision Type2: | District |
| Subdivision Name2: | Waidhofen an der Thaya |
| Parts Style: | para |
| Leader Title: | Mayor |
| Leader Name: | Alois Österreicher |
| Elevation M: | 504 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Registration Plate: | WT |
| Postal Code Type: | Postal code |
| Postal Code: | 3852 |
| Area Code Type: | Area code |
| Area Code: | 02864 |
| Website: | www.gastern.at |
Gastern is a municipality in the district of Waidhofen an der Thaya in the Austrian state of Lower Austria. It has population of approximately 1,165 residents as of 2024.[1]