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 first historical record of the Marfa lights was in 1883 when a young cowhand, Robert Reed Ellison, saw a flickering light while he was driving cattle through Paisano Pass and wondered if it was the campfire of Apache Indians. Other settlers told him they often saw the lights, but that when they investigated they found no ashes or other evidence of a campsite.[5] Joe and Anne Humphreys next reported seeing the lights in 1885. Both stories appear in Cecilia Thompson's book History of Marfa and Presidio County, Texas 1535-1946, which was published in 1985. 
The first published account of the lights appeared in the July 1957 issue of Coronet magazine. In 1976 Elton Miles's Tales of the Big Bend included stories dating to the 19th century and a photograph of the Marfa lights by a local rancher.
Bunnell lists 34 Marfa lights sightings from 1945 through 2008. Monitoring stations were put in place starting in 2003. He has identified "an average of 9.5 MLs on 5.25 nights per year", but believes that the monitoring stations may only be finding half of the Marfa lights in Mitchell Flat.