Budi Lake (Spanish: Lago Budi, Spanish: [ˈbuði]) from the Mapudungun word Füzi which means salt, is a tidal brackish water lake located near the coast of La Araucanía Region, southern Chile.

The lake is part of the boundaries between Saavedra and Teodoro Schmidt commune.

The lake was formed by tectonic movements and eustatic sea level changes.

The 13,275 persons who live around the lake form 3,087 families with 30 years as average age.

The seashore near the lake was the site of the infamous 1849 wreck of Joven Daniel.