Louis Ferreira is a Canadian actor. Ferreira is known for his roles in Stargate Universe as Colonel Everett Young, serial killer Ray Prager in the first season of Durham County, FBI Assistant Director John Pollock in Missing, and Art Blank in Saw IV, Saw V, and Saw 3D. He starred in the CTV series Motive as homicide detective Oscar Vega. Before 2008, he was credited under the stage name Justin Louis.

Stargate Universe is a military science fiction drama television series and part of MGM's Stargate franchise. It follows the adventures of a present-day, multinational exploration team traveling on the Ancient spaceship Destiny several billion light years distant from the Milky Way Galaxy. They are now trying to figure out a way to return to Earth, while simultaneously trying to explore and to survive in their unknown area of the universe. The series, created by Brad Wright and Robert C. Cooper, premiered in the United States on Syfy on October 2, 2009. The series featured an ensemble cast and was primarily filmed in and around Vancouver, British Columbia, Canada. A second season of 20 episodes was announced by Syfy in December 2009.