List of major UFO sightings

Throughout the Twentieth century, there have been numerous unexplained aerial phenomena. Some have become legendary, and the suspicion aroused from the apparent reluctance of government cooperation have led to many UFO conspiracy theories.

• Kecksburg UFO Incident (the unexplained events in Kecksburg, PA in 1965)
• Rendlesham UFO Incident (the events over three nights in England in 1980)
• Roswell UFO Incident (the most infamous UFO incident of all time that occurred in 1947)
• Trent Farm sighting
• Zeta Reticuli Incident (abduction claim in which a map was seen)
• Delphos UFO Incident