Stargate Origins (abbreviated as SGO) is an American science fiction adventure web miniseries created and written by Mark Ilvedson and Justin Michael Terry, part of the Stargate franchise. It premiered with the first three episodes on February 15, 2018 on MGM's Stargate Command subscription service, and concluded with the release of the last three episodes on March 8, 2018.

The program is a prequel to the other works in the franchise, taking place in 1939, some decades before the events of the 1994 Stargate film and its subsequent sequel series. It follows a young Catherine Langford (a minor character from the 1994 film and Stargate SG-1), who goes through the Stargate in a quest to save her father.

The series was announced on July 20, 2017 at the 2017 San Diego Comic-Con as part of Stargate SG-1's 20th anniversary celebration. It consists of ten episodes, each 10 minutes in length. The episodes were concatenated together into a 104-minute-long standalone film, a "Feature Cut" entitled Stargate Origins: Catherine. That film was released on June 19, 2018 on digital retail outlets around the world in SD, HD, and 4K formats.