In folklore, the Loch Ness Monster is an aquatic being which reputedly inhabits Loch Ness in the Scottish Highlands. It is similar to other supposed lake monsters in Scotland and elsewhere, and is often described as being large in size, with a long neck and one or more humps protruding from the water. Popular interest and belief in the creature has varied since it was brought to worldwide attention in 1933. Evidence of its existence is anecdotal, with few disputed photographs and sonar readings.
The creature commonly appears in Western media where it manifests in a variety of ways. A fraction of believers and cryptozoologists propose that the creature represents a line of long-surviving dinosaurs. The scientific community regards the Loch Ness Monster as a being from folklore without biological basis, explaining sightings as hoaxes, wishful thinking and the misidentification of mundane objects.