| Lengau | |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 48°N 13.2167°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Upper Austria |
| Subdivision Type2: | District |
| Subdivision Name2: | Braunau am Inn |
| Parts Style: | para |
| Leader Title: | Mayor |
| Leader Name: | Erich Rippl |
| Elevation M: | 532 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Registration Plate: | BR |
| Postal Code Type: | Postal code |
| Postal Code: | 5211 |
| Area Code Type: | Area code |
| Area Code: | 07746 |
| Website: | www.gemeindelengau.at |
Lengau is a municipality in the district of Braunau am Inn in the Austrian state of Upper Austria.