Grignetta, Summit mountain in Province of Lecco, Italy

Grignetta, also called Grigna meridionale or Grigna di Campione, is a 2177 m limestone mountain in the Grigne group above Mandello del Lario. It has two slopes, south toward the Piani Resinelli and Lecco and north toward the Grignone, separated by two crests: the Segantini crest to the west and the Sinigaglia crest to the east. Its rocks hold marine fossils, and towers such as the Sigaro Dones and the Torrioni Magnaghi rise on its flanks.

During the 20th century, renowned climbers including Riccardo Cassin and Walter Bonatti used the slopes to develop and refine alpine climbing methods. Their work on these challenging terrain helped shape modern mountaineering practice in the region.

The mountain's name appears in the mountain song "La leggenda della Grigna", where the Grignetta is the sentinel who kills the knight on the orders of the warrior Grigna. The peak is also called Grigna di Campione, and its rock towers carry climbers' names such as the Torrione Magnaghi and the Sigaro Dones.

Several hiking trails reach the summit, with the Rifugio Rosalba serving as a base for accessing the various ridges and offering lodging facilities. Proper mountain shoes and rock climbing experience are important, particularly for the more technical ridge sections.

The Bivacco Ferrario on the summit is a small metal structure that stays open at all times, so climbers can use it without a key or booking. It is the only shelter right at the top of the Grignetta, above the Rifugio Porta and Rifugio Rosalba that serve the lower routes.