Sirius is a 2013 documentary directed by Amardeep Kaleka, based upon ufologist Steven M. Greer's book Hidden Truth, Forbidden Knowledge. Partially funded by a successful Kickstarter campaign, the film is narrated by Thomas Jane and follows Greer's efforts to reveal what he claims is information about top secret energy projects and propulsion techniques.

Sirius features interviews from former officials from the government and military, as well as images and a DNA analysis of the 6-inch (15 cm) skeleton known as Ata that was found in the Atacama Desert in northern Chile in 2003. The film premiered on April 22, 2013 in Los Angeles, California, as well as online.