Millennium is an American television series created by Chris Carter (creator of The X-Files), which aired on Fox from October 25, 1996, to May 21, 1999. The series follows the investigations of ex-FBI agent Frank Black (Lance Henriksen), now a consultant, with the ability to see inside the minds of criminals, working for a mysterious organization known as the Millennium Group.

The series was filmed in Vancouver, British Columbia, though most episodes were ostensibly set in or around Seattle, Washington. The theme music was composed by Mark Snow, who also created the distinctive theme music for The X-Files. Although the series premiered with impressive ratings, viewership declined throughout its three-season run, and it was canceled by Fox in early 1999. A seventh-season episode of The X-Files, titled "Millennium", featured the Millennium Group and Frank Black, as a way of giving the show some closure.

In 2018, Millennium was ranked #87 in Rotten Tomatoes's 100 Best Sci-Fi TV Shows of All Time. That same year, Millennium After the Millennium, a documentary based on the show, was released. It features interviews with Carter, Henriksen and other people who worked on the show.