Lariosauro is a cryptid reported to live in Lake Como in Italy, about 30 miles north of Milan. Como is one of the deepest European lakes, at about 410 meters (1200 feet) at the deepest location

In 1946, eye witnesses allegedly reported seeing a reptile-like animal swimming in the waters of the lake. It was called lariosauro, the same name used a century before to name a prehistoric reptile whose fossilized remains were found by the lake (Lariosaurus balsami). A weekly of Como, a week after the first article, wrote it was a sturgeon, but the sturgeon as well as the monster appear to be more simply a hoax invented by the press.

There were other sightings, or alleged sightings, in Lake Como.

Skeptic researcher Giorgio Castiglioni, who studied these cases, thinks that the animal of 1954 was an otter, the monster of August 1957 a hoax, the beast of September 1957 possibly a pike and the 2003 eel actually a group of fish swimming together.