| Schnittlauchinsel | |
| Location: | Walensee |
| Map: | Switzerland |
| Elevation M: | 420 |
| Country: | Switzerland |
| Country Admin Divisions Title: | Canton |
| Country Admin Divisions: | St. Gallen |
| Country Admin Divisions Title 1: | District |
| Country Admin Divisions 1: | Sarganserland |
The Schnittlauchinsel (German, lit. "chives island") is an island in the Walensee, located in the Canton of St. Gallen. It is the only island in the lake and among the largest in the canton of St. Gallen. The island has a length of 80 metres and a maximum width of 20 metres. Its highest point is 420 metres above sea level, only 1 metre above lake level (419 m). The minimum distance from the shore is about 320 metres.
Politically, the island belongs to the municipality of Quarten in the district of Sarganserland.