Lago di Sabaudia, Protected lake in Province of Latina, Italy.

Lago di Sabaudia is a brackish coastal lagoon in the Province of Latina, entirely within the Circeo National Park and the municipality of Sabaudia. It covers about 3.9 km², with a perimeter of roughly 20 km, an average depth of 4.5 m and a maximum of 10 m. A coastal dune separates it from the Tyrrhenian Sea, and two artificial channels, the Caterattino outlet and the Canale Romano at Torre Paola, renew its water. Its banks carry Mediterranean scrub tolerant of the water's high salinity.

The lagoon formed over thousands of years through sand deposits and the gradual movement of coastal dunes. In the 20th century it was brought under protection as part of Circeo National Park and later designated as a Natura 2000 site.

Local fishermen still work the lake in small boats, especially in the early morning hours when the water is at its stillest. Along the shore, educational trails help visitors understand how wetland ecosystems function in practice.

The Giovanni XXIII Bridge connects the dune area to Sabaudia town and is a good starting point for taking in the water and surrounding landscape. Designated areas allow quiet water activities such as kayaking for those who want to explore further.

The lagoon sits along one of the main flight paths for birds migrating between Africa and Europe, making it a natural resting point along the way. In spring and autumn, visitors can watch large flocks settle on the water during those peak migration periods.