Cannalonga is a town and comune in the Province of Salerno, Campania, southern Italy.

It became well known in the region around 1450, when the tradition of the festival called Fiera di Santa Lucia started.

The most popular historical monument there is the "Palazzo Ducale" (the duke's palace), which is located in the heart of the town, facing Piazza del Popolo.

The palace belongs to the Dukes of Cannalonga, the Mogrovejo-Romano family.

According to some people, this name is due to the large number of bamboo-stems (it:canne di bambù) present in the area.