Lago del Segrino, Alpine lake near Como, Italy

Lago del Segrino is a small pre-alpine lake in the Province of Como, in the Lombardy region of northern Italy. It sits at around 374 meters above sea level and is enclosed by wooded hills that come right down to the water's edge.

The lake's name comes from the Latin adaptation (Sacrinum/Secrinum) of the Celtic toponym segarinos, meaning "stream of respect", perhaps linked to a necropolis or a sacred spring. Bronze Age tombs were found on the north shore in 1971 during work to enlarge the Gajum bottling plant, and three Iron Age Golasecca-culture tombs were found at Longone al Segrino in the late 19th century. Since 1984 the lake has formed the Parco locale di interesse sovracomunale Lago del Segrino.

The name Segrino comes from the Latin adaptation Sacrinum or Secrinum of the Celtic segarinos, meaning "stream of respect", perhaps because of a necropolis or a sacred spring. Bronze Age tombs found north of the lake in 1971 and 1974, and Iron Age Golasecca-culture tombs found south at Longone al Segrino in the late 19th century, support the idea of a burial ground by the shore.

A protected cycle and foot path runs the full perimeter, about five kilometres, through Canzo, Longone al Segrino and Eupilio. The lake is a fishing reserve, so angling requires a specific permit. Swimming is not listed among the permitted activities, and the outlet near Eupilio is controlled by a sluice gate.

Water skiing was popular on the lake in the 1960s, but the activity was later banned because it was incompatible with the lake's environmental balance. The lake has no visible inflow along its perimeter; scholars link this to submerged karst springs, and the valley is made of Domaro limestone.