Giorgio A. Tsoukalos (Greek: Γεώργιος Α. Τσούκαλος; born March 14, 1978) is a Greek-Swiss television personality. He is a proponent of the idea that ancient alien astronauts interacted with ancient humans. He is most famous for his appearances on the television series Ancient Aliens.
Tsoukalos has appeared on The Travel Channel, The History Channel, the Sci-Fi Channel, the National Geographic Channel, as well as Coast to Coast AM, and was a consulting producer on 23 episodes of Ancient Aliens. He is the co-founder of Legendary Times magazine, which last published in 2008. The magazine featured articles from Erich von Däniken, David Hatcher Childress, Peter Fiebag, Robert Bauval, and Luc Bürgin on the topic of ancient astronauts and related subject matter.