| Niedernsill | |
| Native Name: | Niedansü |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 47.2833°N 12.65°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Salzburg |
| Subdivision Type2: | District |
| Subdivision Name2: | Zell am See |
| Parts Style: | para |
| Leader Title: | Mayor |
| Leader Name: | Günther Brennsteiner |
| Elevation M: | 768 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Registration Plate: | ZE |
| Postal Code Type: | Postal code |
| Postal Code: | 5722 |
| Area Code Type: | Area code |
| Area Code: | 06548 |
| Website: | www.niedernsill.at |
Niedernsill (bar|Niedansü) is a town located in the Zell am See district in the state of Salzburg in Austria. It is best known for its winter sports of skiing and its summer activities of hiking.