Piazzogna is a former municipality in the district of Locarno in the canton of Ticino in Switzerland.

On 25 April 2010, the former municipalities of Caviano , Contone , Gerra Gambarogno , Indemini , Magadino , Piazzogna, San Nazzaro, Sant'Abbondio and Vira Gambarogno merged in the new municipality of Gambarogno.

Piazzogna is first mentioned in 1337 as Piazognia. It was mentioned again between 1542 and 1546 as part of the award given by the local bailiff during arbitration. The arbitration dealt with the rights of neighboring villages to use alpine meadows. Piazzogna belonged first to the municipality and parish of Vira, but by 1704 it had become an independent municipality.