Sanguinet (French pronunciation: [sɑ̃ɡinɛ]; Sanguinet in Occitan) is a commune in the Landes department in Nouvelle-Aquitaine in southwestern France.

The commune is situated in the north of the department of Landes.

It would have originally flowed into the Atlantic Ocean, but the mouth of the river was blocked over the centuries by sand dunes on the coast and thus creating the lake and many others along Landes' Atlantic Coast.

The lake has covered previous sitings of a town many centuries ago.

Sanguinet is twinned with the town of Neyland in Pembrokeshire, Wales.