| Wernstein am Inn | |
| Native Name: | Weanstoa |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 48.5086°N 13.4603°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Upper Austria |
| Subdivision Type2: | District |
| Subdivision Name2: | Schärding |
| Parts Style: | para |
| Leader Title: | Mayor |
| Leader Name: | Johann Mayr |
| Elevation M: | 319 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Registration Plate: | SD |
| Postal Code Type: | Postal code |
| Postal Code: | 4783 |
| Area Code Type: | Area code |
| Area Code: | 07713 |
| Website: | www.wernstein.at |
Wernstein am Inn (Central Bavarian: Weanstoa) is a municipality in the district of Schärding in the Austrian state of Upper Austria.
Wernstein lies in the Innviertel. About 21 percent of the municipality is forest, and 67 percent is farmland.