The Marfa lights, also known as the Marfa ghost lights, have been observed near U.S. Route 67 on Mitchell Flat east of Marfa, Texas, in the United States. They have gained some fame as onlookers have attributed them to paranormal phenomena such as ghosts, UFOs, or will-o'-the-wisp. Scientific research suggests that most, if not all, are atmospheric reflections, automobile headlights or campfires.

The Brown Mountain lights are purported ghost lights near Brown Mountain in North Carolina. The earliest published references to strange lights there are from around 1910, at about the same time electric lighting was becoming widespread in the area. In 1922, a USGS scientist, George R. Mansfield, used a map and an alidade telescope to prove that the lights that were being seen were trains, car headlights, and brush fires, which ended widespread public concern.