Lago di Massaciuccoli

Lago di Massaciuccoli
Location	Province of Lucca, Tuscany
Coordinates	43°50′42″N 10°19′30″E / 43.84500°N 10.32500°E / 43.84500; 10.32500Coordinates: 43°50′42″N 10°19′30″E / 43.84500°N 10.32500°E / 43.84500; 10.32500
Basin countries	Italy
Surface area	6.9 km²

Lago di Massaciuccoli is a lake in the Province of Lucca, Tuscany, Italy. Its surface area is 6.9 km². It is located mainly in the municipality of Massarosa and partly in Torre del Lago, a civil parish of Viareggio.

The lake was known in ancient times as the Fossis Papirianis, a name used in the Tabula Peutingeriana. The composer Giacomo Puccini lived nearby and frequently hunted around the lake; the nearby village of Torre del Lago is sometimes mentioned with suffix "Puccini" in his honour.

The lake is home to the large extent of Cladium mariscus in Italy. However, vegetation and wildlife have shrunken substantially since the 20th century, due to unclear reasons.