Longone al Segrino (Brianzöö: Lungun [lũˈɡũː]) is a small village and comune between Como and Lecco in the province of Como in Lombardy, Italy.

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 1.5 square kilometres (0.58 sq mi).

[3] The municipality of Longone al Segrino contains the frazione (subdivision) Morchiuso.

Longone al Segrino borders the following municipalities: Canzo, Erba, Eupilio, and Proserpio.