Longone al Segrino (Brianzöö: ) is a small village and between Como and Lecco in the province of Como in Lombardy, Italy. It is located about north of Milan and about east of Como. It is known for its lake, an unusual case of an intact ecosystem. As of 31 December 2004, it had a population of 1,543 and an area of .
The municipality of Longone al Segrino contains the frazione (subdivision) Morchiuso.
Longone al Segrino borders the following municipalities: Canzo, Erba, Eupilio, and Proserpio.