La Valletta Brianza (Brianzöö: ) is a comune in the province of Lecco, Lombardy, northern Italy. It was created on 30 January 2015 when the two former communes of Perego and Rovagnate merged. The communal seat is located in the latter hamlet.
It is about northeast of Milan and about south of Lecco.
In 2025, the nunnery at Bernaga was destroyed by fire; all the 20-odd nuns escaped.
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