In late December 1980, there were a series of reported sightings of unexplained lights near Rendlesham Forest, Suffolk, England, which have become linked with claims of UFO landings. The events occurred just outside RAF Woodbridge, which was used at the time by the U.S. Air Force. USAF personnel, including deputy base commander Lieutenant Colonel Charles I. Halt, claimed to see things they described as a UFO sighting.

The occurrence is the most famous of claimed UFO events to have happened in the United Kingdom, ranking among the best-known reported UFO events worldwide. It has been compared to the Roswell UFO incident in the United States and is sometimes referred to as "Britain's Roswell". The Ministry of Defence (MoD) stated the event posed no threat to national security, and it therefore never was investigated as a security matter. The sightings have been explained as a misinterpretation of a series of nocturnal lights – a fireball, the Orford Ness lighthouse and bright stars.

A comprehensive 2009 evaluation by scientific sceptic author Brian Dunning concluded there was nothing unusual about the incident.